K35.890 — Other acute appendicitis without perforation or gangrene
K35.890 is a billable, specific ICD-10-CM code for other acute appendicitis without perforation or gangrene. It is valid for submission on a claim.
Risk adjustment
K35.890 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
K35.890 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55336Billing and Coding: Retroperitoneal Ultrasound
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56456Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
How K35.890 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 K35.890.
- Appendicitis›acute›specified NEC
Related codes at this level
Codes that share K35.89. If K35.890 is not quite right, the correct code is usually one of these.
Questions about K35.890
- Is K35.890 a billable ICD-10-CM code?
- Yes. K35.890 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K35.890 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of appendix (K35-K38).