835 Denial Combination

CO-197+M21

CO

Contractual Obligation · Claim-Level Adjustment

Authorization

What This Combination Means

This denial indicates that authorization was missing for a service provided in a home setting, and the payer is specifically flagging that the place of residence documentation was also missing, incomplete, or invalid on the claim. The payer requires both valid authorization and proper home location information to adjudicate this claim. The provider must write off the amount under their contract.

Financial Responsibility

provider writeoff

The provider is contractually obligated to write off the denied amount and cannot balance bill the patient. The denial stems from missing authorization and incomplete home residence documentation.

48%

Appeal Success

30-60 days (appeal process)

Avg. Resolution

Hard

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-197+M21 combination — not generic advice.

Appealable:Authorization-related denials are appealable when the provider can demonstrate authorization was obtained or document the valid place of residence for home-based services.
  1. 1

    Verify authorization records and home location documentation

    Locate the precertification/authorization approval and validate that the place of residence was documented at the time of service for this home-based care

  2. 2

    Complete the place of residence field with specific address information

    Ensure the home service location includes complete address, not just city/state, as payers require precise location data for home health services

  3. 3

    Submit appeal with authorization proof and corrected location data

    Include authorization number, approval dates, and complete place of residence information; reference both the missing authorization and M21 location deficiency in appeal documentation

Specialty Context

How CO-197+M21 typically presents across different practice types.

Dental

Medical

Common for home health services, durable medical equipment delivered to home, home infusion therapy, and hospice care where both authorization and patient residence address are required fields

Behavioral Health

Relevant for in-home behavioral health visits, home-based crisis intervention, and Applied Behavior Analysis (ABA) therapy provided in the patient's residence requiring prior authorization

Individual Code References

View the standalone definition for each code in this combination.

CARC 197RARC M21

Medicare Contractor Guidance for CARC 197

Noridian + uhc + aetna + bcbs_az

Prior authorization 14-byte Unique Tracking Number (UTN) was not appended to claim Special modifier to bypass the prior authorization process was not appended to claim line. This HCPCS code requires prior authorization

How to Prevent CARC 197 Denials

  • ✓

    Obtain prior authorization for item, prior to delivery

  • ✓

    Ensure to append 14-byte UTN provided within the affirmative decision letter to the claim

  • ✓

    If prior authorization is being bypassed, ensure the special modifiers required are appended to the claim line

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Synthesized from official definitions — not from training data

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