K66.9 — Disorder of peritoneum, unspecified
K66.9 is a billable, specific ICD-10-CM code for disorder of peritoneum, unspecified. It is valid for submission on a claim.
Risk adjustment
K66.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
K66.9 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
How K66.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K66.9.
- Disease, diseased›peritoneum
Related codes at this level
Codes that share K66. If K66.9 is not quite right, the correct code is usually one of these.
Questions about K66.9
- Is K66.9 a billable ICD-10-CM code?
- Yes. K66.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K66.9 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of peritoneum and retroperitoneum (K65-K68).