Is S91.156 a billable ICD-10-CM code?

No. S91.156 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S91.156 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the ankle and foot (S90-S99).

What cannot be coded together with S91.156?

S91.156 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S91.156 (S91.15, S91) and apply to it just the same.

S91.156

S91.156 — Open bite of unspecified lesser toe(s) without damage to nail

Non-billable headerICD-10-CM

S91.156 is a non-billable header ICD-10-CM code for open bite of unspecified lesser toe(s) without damage to nail. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category S91

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above S91.156

These are not written on S91.156, but they bind it: a note on a category applies to every code beneath it. Billing S91.156 with anything listed here is a denial.

Written on S91.15 — Open bite of toe without damage to nail

superficial bite of toe (S90.46-, S90.47-)

Written on S91 — Open wound of ankle, foot and toes

open fracture of ankle, foot and toes (S92.-with 7th character B)
traumatic amputation of ankle and foot (S98.-)

Risk adjustment

S91.156 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.

Code history

S91.156 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead S91.156

3 child codes. Green means billable.

Related codes at this level

Codes that share S91.15. If S91.156 is not quite right, the correct code is usually one of these.

Questions about S91.156

Is S91.156 a billable ICD-10-CM code?: No. S91.156 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S91.156 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the ankle and foot (S90-S99).
What cannot be coded together with S91.156?: S91.156 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S91.156 (S91.15, S91) and apply to it just the same.