Medicare ADR Response Playbook: How to Answer an Additional Documentation Request Without Triggering a Denial

Introduction

An Additional Documentation Request, or ADR, is one of the most common Medicare review letters a provider will ever receive. It asks you to send medical records that support a claim. The request may look routine, but how you respond often decides whether the claim is paid or denied. A late response, a missing order, an unsigned note, or a disorganized packet can turn a valid claim into a denial and, in postpayment review, an overpayment.

The good news is that most ADR denials are preventable. CMS publishes detailed rules on ADR timeframes, what contractors must include in their requests, how they handle late documentation, and how they treat missing signatures. Providers that understand these rules and follow a consistent process can significantly improve their results.

This playbook explains what an ADR is, who sends them, the deadlines, what a compliant ADR letter contains, how to build a strong response, the most common causes of ADR denials, what happens if you miss the deadline, and how to build ADR readiness into daily operations. It is educational and does not replace professional advice. Two companion articles cover building the ADR response packet and handling missing signatures with attestations and signature logs.

What Is an ADR?

CMS's Medicare Program Integrity Manual, Chapter 3, Section 3.2.3, explains that when a contractor cannot make a coverage or coding determination based on the claim, any attachments, and the billing history, it may request additional documentation by issuing an ADR. Contractors may also collect documentation related to the beneficiary's condition before and after the service to get a more complete picture of the clinical condition.

CMS's manual directs contractors to cite Sections 1815(a), 1833(e), and 1862(a)(1)(A) of the Social Security Act as their authority to require documentation. In plain terms, Medicare does not have to pay a claim unless the provider furnishes the information necessary to determine that payment is due and that the service was reasonable and necessary.

Prepayment Versus Postpayment ADRs

• Prepayment ADRs are sent before a claim is paid. If records are not received or do not support the claim, the claim is denied before payment.

• Postpayment ADRs are sent after a claim has been paid. If the claim is denied after review, the payment becomes an overpayment that the MAC will recover.

Who Sends ADRs?

Several CMS contractors issue ADRs:

• Medicare Administrative Contractors (MACs), for routine medical review and Targeted Probe and Educate (TPE).

• Recovery Audit Contractors (RACs), for postpayment reviews of approved topics.

• The Supplemental Medical Review Contractor (SMRC), for national review projects.

• The Comprehensive Error Rate Testing (CERT) contractor, for the national improper payment measurement.

• Unified Program Integrity Contractors (UPICs), for fraud, waste, and abuse investigations.

Always confirm which contractor sent the request, because deadlines and procedures differ.

ADR Deadlines

45 Days for MACs, RACs, and the SMRC

CMS's Program Integrity Manual states that providers and suppliers have 45 calendar days to respond to MAC, RAC, or SMRC requests, for both prepayment and postpayment review, consistent with 42 CFR 405.903 and 405.929.

30 Days for UPICs

The manual allows 30 days for responses to UPIC requests.

CERT

The CERT program has its own process. CMS states that if no documentation is received within 75 days of the initial CERT request, the claim is classified as a no documentation error.

Third-Party Requests

CMS's manual explains that when a contractor sends an ADR to a third party, such as an ordering physician, the billing provider must also be asked for the same information first or at the same time. Third parties have 45 days to respond (30 days for UPIC requests) from the date of the most recent ADR.

Good Cause for Late Documents

The manual allows contractors to accept documentation received after the deadline for good cause, such as natural disasters or business interruptions. Providers should not rely on this exception.

esMD Receipt Timing

For documentation sent through the Electronic Submission of Medical Documentation (esMD) system, the manual states that the esMD cloud receipt date controls.

What Happens If You Do Not Respond

Under 42 CFR 405.930 and CMS's manual, reviewers deny claims when requested documentation is not received within the expected timeframe, including any extensions. CMS's manual instructs MACs to deny non-response claims using group code CO, Claim Adjustment Reason Code 50, and Remittance Advice Remark Code M127. Because group code CO is used, the provider is financially responsible and generally may not bill the beneficiary.

What a Compliant ADR Letter Contains

CMS's manual requires each ADR to include specific elements:

• An introduction identifying CMS, the program, and the applicable laws.

• The reason the claim was selected.

• The required action.

• The due date.

• The consequences of not responding.

• Instructions.

• Submission methods.

• Contact information.

• Any attachments or supplementary information.

CMS also requires postpayment ADRs to follow a unified format, so letters from different contractors look more consistent. The manual also states that ADRs should request only the specific documents needed. Reading each section carefully tells you exactly what the reviewer needs, why the claim was selected, and how to submit.

The ADR Response Playbook: Step by Step

Step 1: Recognize and Route the Request Immediately

ADRs may arrive by mail, through your MAC's provider portal, in your claims processing system, or electronically through esMD. Make sure staff who handle mail, portals, and claim status know to route ADRs to a designated coordinator the same day.

Step 2: Log the Request

Record the contractor, the date of the letter, the date received, the claim numbers, beneficiary names, dates of service, documents requested, the reason for selection, and the due date.

Step 3: Calendar the Deadline With a Buffer

Set an internal target well ahead of the official deadline, for example 30 days for a 45-day MAC request, and set reminders.

Step 4: Identify the Applicable Requirements

Read the reason for selection and identify the coverage and documentation rules for the service, such as:

• National Coverage Determinations (NCDs).

• Local Coverage Determinations (LCDs) and billing and coding articles from your MAC.

• Medicare benefit policy and claims processing manual provisions.

• Any specific documentation checklists published by your MAC.

Make a checklist of every element the reviewer will look for.

Step 5: Gather Complete Records

Collect all documentation that supports the claim, which may include:

• Orders and referrals.

• Physician or practitioner progress notes.

• Certifications and recertifications.

• Plans of care.

• Test results and reports.

• Medication administration records.

• Therapy notes and evaluations.

• Proof of delivery for DMEPOS.

• Advance Beneficiary Notices, if applicable.

• Records from ordering or referring providers.

CMS's manual allows reviewers to consider documentation of the beneficiary's condition before and after the service, so include relevant history when it supports medical necessity.

Step 6: Request Third-Party Records Right Away

If your claim depends on records from another provider, such as an ordering physician's notes for a DMEPOS item, request them immediately. CMS's manual notes that documents created by suppliers or providers alone, such as certificates of medical necessity, supplier statements, or physician attestations, do not by themselves sufficiently document medical necessity. The underlying medical record must support the claim.

Step 7: Conduct a Pre-Submission Review

Before sending anything, review the records against your checklist:

• Is every required element present?

• Are the records for the correct beneficiary and date of service?

• Are entries signed and dated, or do you need a signature log or attestation?

• Are records legible?

• Are amendments, corrections, or late entries clearly identified with the date and author?

• Does the documentation support the specific code and level of service billed?

Step 8: Address Signature Issues Proactively

CMS's MLN fact sheet on signature requirements explains that submitting a complete record with proper signatures helps avoid medical review delays. If signatures are illegible, include a signature log. If a signature is missing from documentation other than an order, consider whether a signature attestation statement from the author is appropriate. See the companion article on signatures for details.

Step 9: Build an Organized Response Packet

Include the ADR letter or the contractor's barcode cover sheet, a short cover letter with an index, and records in a logical order. See the companion article on building an ADR response packet.

Step 10: Submit Using an Accepted Method

CMS's manual states that MACs, CERT, the SMRC, and RACs accept documents via paper, fax, CD or DVD, esMD, and contractor website portals. Follow the instructions in the ADR letter and keep proof of submission.

Step 11: Confirm Receipt

Use your MAC's portal or esMD tracking to confirm that the documentation was received and matched to the correct claim.

Step 12: Track the Outcome and Act on It

Monitor claim status, review results letters, and remittance advice. If a claim is denied, review the reason, decide whether to appeal, and fix any process issues.

Common Reasons ADR Responses Lead to Denials

No Response or Late Response

The most avoidable denial. It usually results from missed or misrouted mail, outdated contact information, or unclear responsibility.

Missing Key Documents

Examples include missing orders, missing certifications or plans of care, missing face-to-face encounter documentation, missing proof of delivery, or missing test results.

Documentation Does Not Support Medical Necessity

The records may show that a service was provided but not why it was reasonable and necessary under applicable coverage criteria. Generic or templated language without patient-specific clinical detail is a frequent problem.

Signature Problems

Missing or illegible signatures without a signature log or attestation, or unsigned orders where a signature is required, can result in denials.

Coding Not Supported

The documentation may support a different code or a lower level of service than billed.

Wrong Records

Sending records for the wrong patient, the wrong date of service, or a different claim.

Disorganized Submissions

Sending an entire chart without organization, mixing records for multiple claims, or omitting the ADR letter or cover sheet can make it hard for reviewers to find the key information.

Records Created or Altered After the Fact

CMS requires amendments, corrections, and delayed entries to clearly identify the date and author and to be clearly and permanently marked. Records that appear to have been altered to support a claim can lead to denials and, in serious cases, referrals for potential fraud.

Insufficient Documentation Versus Medical Necessity Denials

CMS's manual distinguishes between different types of denials after review:

• If documentation does not meet a benefit category requirement, the claim may be denied for failing that requirement.

• If documentation is present but does not support that the service was reasonable and necessary, the claim may be denied under the reasonable and necessary criteria.

Understanding which type of denial you received helps you decide how to respond and what to fix.

What If You Miss the Deadline?

Late Documentation and Reopening

CMS's manual explains that MACs may reopen a claim denied for non-response if the documentation is received within a reasonable period after the denial, generally 15 calendar days after the denial date. When this happens, the MAC must notify the provider within three business days and make a determination within 60 calendar days of receiving the documentation. RAC postpayment reviews handle late documentation differently depending on whether a demand letter has been issued.

Appeal

If the reopening window has passed, the provider can generally submit the documentation with a redetermination request, the first level of Medicare appeal. Redeterminations must generally be filed within 120 days of receiving the initial determination. For postpayment overpayments, filing within 30 days of the demand letter can limit recoupment under 42 CFR 405.379.

Fix the Root Cause

Review why the deadline was missed and correct it, such as updating mailing addresses with your MAC, assigning a backup coordinator, or enabling portal and esMD notifications.

ADRs in Targeted Probe and Educate

Under TPE, MACs review a sample of claims, typically through ADRs, then provide one-on-one education. Providers may go through up to three rounds. Every ADR response in a TPE round affects the provider's error rate, and high error rates after three rounds can lead to referral to CMS for further action, such as extrapolation, referral to a UPIC or RAC, or other measures. Treat every TPE ADR with the same care as a larger audit.

ADRs and Broader Compliance Obligations

ADR results provide valuable feedback. If reviews find errors, providers should:

• Identify the root cause and fix it.

• Educate the staff involved.

• Evaluate whether similar claims outside the review were also paid in error.

• Consider their obligations under the 60-day overpayment rule at 42 CFR 401.305.

Building ADR Readiness Into Daily Operations

• Designate an ADR coordinator and backup.

• Maintain a central ADR log for all contractors.

• Keep mailing addresses, portal accounts, and contact information current with your MAC.

• Register for esMD or use your MAC's portal to receive and respond electronically.

• Create service-specific documentation checklists based on NCDs, LCDs, and MAC guidance.

• Maintain a current signature log for all clinicians.

• Train clinicians on documenting medical necessity and signing entries promptly.

• Conduct internal audits of frequently reviewed services.

• Review ADR results monthly and share lessons learned.

A Sample ADR Response Timeline for a 45-Day Request

• Day 1: Receive, route, and log the ADR.

• Days 2 to 5: Identify requirements and request any third-party records.

• Days 5 to 15: Gather internal records.

• Days 15 to 25: Pre-submission review and signature checks.

• Days 25 to 30: Assemble the packet and submit.

• Days 30 to 35: Confirm receipt.

• Days 35 to 45: Buffer for unexpected delays.

Roles and Responsibilities in an ADR Response

Clear ownership prevents missed deadlines and incomplete submissions. A typical ADR response team includes:

• ADR coordinator. Receives, logs, and routes requests; tracks deadlines; assembles and submits the packet; confirms receipt.

• Health information management. Retrieves and copies records, checks completeness, and manages release of information.

• Clinical reviewer. Reviews records against coverage criteria and identifies gaps in medical necessity documentation.

• Coding or billing reviewer. Confirms that documentation supports the codes, units, and modifiers billed.

• Clinicians. Provide signature logs and, where appropriate, signature attestations for their own entries.

• Compliance officer. Monitors trends, oversees corrective actions, and evaluates potential overpayment obligations.

For small practices, one or two people may cover several roles, but each responsibility should still be assigned.

A Hypothetical Example

A home health agency receives a postpayment ADR from its MAC for five episodes. The coordinator logs the request the same day and sets an internal target of 30 days. The clinical reviewer identifies the applicable requirements: a face-to-face encounter, a signed certification and plan of care, documentation of homebound status, and skilled need.

During pre-submission review, the team finds that one face-to-face encounter note was written by the referring physician's office and was not in the agency's chart. The coordinator requests it immediately and receives it two weeks later. The team also finds an illegible physician signature on a plan of care and includes the physician practice's signature log. Each episode is packaged separately with the ADR cover sheet, a short cover letter, and an index.

The agency submits through the MAC portal on day 28 and confirms receipt. All five episodes are approved. Without the early third-party request and signature log, at least two episodes could have been denied.

Frequently Asked Questions

How long do I have to respond to a Medicare ADR?

Generally 45 calendar days for MAC, RAC, and SMRC requests, and 30 days for UPIC requests. Always follow the date in your letter.

What happens if I do not respond?

The claim will be denied. CMS's manual directs MACs to use group code CO, CARC 50, and RARC M127 for non-response denials.

Can I send the whole medical record?

You can include relevant documentation beyond the date of service, but sending an entire chart without organization makes review harder. Focus on what the ADR requests and what supports the claim, organized clearly.

What if I miss the deadline?

MACs may reopen if documentation is received within a reasonable period, generally 15 calendar days after the denial. Otherwise, submit the documentation with a redetermination request.

Can a signature attestation fix an unsigned order?

No. CMS states that signature attestations are not accepted for orders when a signature is required.

Will responding faster help?

Responding early does not change the review standard, but it reduces the risk of missed deadlines, gives you time to fix problems found in pre-submission review, and leaves room to obtain third-party records.

Conclusion

A Medicare ADR is a chance to prove that a claim was properly billed. Most ADR denials result from avoidable problems: late responses, missing documents, signature issues, records that do not support medical necessity, and disorganized submissions. By routing and logging every request, calendaring deadlines with a buffer, identifying the applicable requirements, gathering complete records including third-party documentation, reviewing records before submission, addressing signature issues, submitting an organized packet through an accepted method, confirming receipt, and acting on results, providers can greatly reduce the risk of denial and build a stronger compliance program.

How HealthBridge Can Help

HealthBridge is a healthcare management consulting firm that helps providers build effective ADR response processes, create documentation checklists, review records before submission, assemble organized response packets, manage signature logs and attestations, and track results and appeals. If you need help responding to an ADR or improving your process, please get in touch with us. We will be happy to help you with this topic.

References

• Centers for Medicare & Medicaid Services. Medicare Program Integrity Manual, Chapter 3, Verifying Potential Errors and Taking Corrective Actions. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/pim83c03.pdf

• Centers for Medicare & Medicaid Services. Complying with Medicare Signature Requirements (MLN905364, July 2025). https://www.cms.gov/mln905364-complying-with-medicare-signature-requirements

• Centers for Medicare & Medicaid Services. Medicare Claim Review Programs (MLN Booklet). https://www.cms.gov/outreach-and-education/medicare-learning-network-mln/mlnproducts/downloads/mcrp-booklet-text-only.pdf

• Centers for Medicare & Medicaid Services. Introducing esMD to Providers, Review Contractors, and Health Information Handlers (March 2026). https://edit.cms.gov/files/document/introducing-esmd-providers-review-contractors-health-information-handlers.pdf

• Centers for Medicare & Medicaid Services. Comprehensive Error Rate Testing (CERT). https://www.cms.gov/data-research/monitoring-programs/improper-payment-measurement-programs/comprehensive-error-rate-testing-cert

• Electronic Code of Federal Regulations. 42 CFR 405.903, Medicare Integrity Program Requirements. https://www.ecfr.gov/current/title-42/section-405.903

• Electronic Code of Federal Regulations. 42 CFR 405.929, Post-Payment Review. https://www.ecfr.gov/current/title-42/section-405.929

• Electronic Code of Federal Regulations. 42 CFR 405.930, Failure to Respond to Additional Documentation Requests. https://www.ecfr.gov/current/title-42/section-405.930

• Electronic Code of Federal Regulations. 42 CFR 405.379, Limitation on Recoupment of Provider and Supplier Overpayments. https://www.ecfr.gov/current/title-42/section-405.379

• Electronic Code of Federal Regulations. 42 CFR 401.305, Requirements for Reporting and Returning of Overpayments. https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-A/part-401/subpart-D/section-401.305

• U.S. Social Security Administration. Social Security Act, Section 1862, Exclusions From Coverage and Medicare as Secondary Payer. https://www.ssa.gov/OP_Home/ssact/title18/1862.htm

• Centers for Medicare & Medicaid Services. Original Medicare (Fee-for-Service) Appeals. https://www.cms.gov/medicare/appeals-grievances/fee-for-service