Is K37 a billable ICD-10-CM code?

Yes. K37 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does K37 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Diseases of appendix (K35-K38).

What cannot be coded together with K37?

K37 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

K37

K37 — Unspecified appendicitis

Billable / specific codeICD-10-CM

K37 is a billable, specific ICD-10-CM code for unspecified appendicitis. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

unspecified appendicitis with peritonitis (K35.2-, K35.3-)

Risk adjustment

K37 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

K37 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 K37 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 K37.

Appendicitis(pneumococcal) (retrocecal)
Perityphlitis

Questions about K37

Is K37 a billable ICD-10-CM code?: Yes. K37 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does K37 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Diseases of appendix (K35-K38).
What cannot be coded together with K37?: K37 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.