S31.805A — Open bite of unspecified buttock, initial encounter
Is S31.805A billable?
Yes, but S31.805A is an unspecified code. S31.805A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S31.805A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S31.805A — the more specific alternatives are listed below.
S31.805A at a glance
| Code | S31.805A |
|---|---|
| Description | Open bite of unspecified buttock, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in S31.805A?
In S31.805A, the 7th character A means initial encounter. The 7th character is required for S31.805A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S31.805A group to?
S31.805A sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 604Trauma to the Skin, Subcutaneous Tissue and Breast with MCCmedical
- 605Trauma to the Skin, Subcutaneous Tissue and Breast without MCCmedical
How is S31.805A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S31.805, the nearest indexed parent of S31.805A. Use them to find the family, then select the specific code.
- Bite › buttock (s) (animal) (human)
Excludes1 — never code together
The conditions below can never be reported together with S31.805A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- superficial bite of buttock (S30.870)
Inclusion terms
Alternative wording in documentation that is classified to S31.805A.
- Bite of buttock NOS
Excludes1 — never code together — inherited from S31
The conditions below can never be reported together with S31.805A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes1 — never code together — inherited from S31.805
The conditions below can never be reported together with S31.805A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- superficial bite of buttock (S30.870)
Use additional code — inherited from Chapter 19
Report an additional code alongside S31.805A to fully describe the condition. S31.805A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S31.805A, but a patient may have both at the same time. When documentation supports it, S31.805A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S30-S39
The conditions below are not part of S31.805A, but a patient may have both at the same time. When documentation supports it, S31.805A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S31
The conditions below are not part of S31.805A, but a patient may have both at the same time. When documentation supports it, S31.805A and the excluded code may both be reported.
Code also — inherited from S31
Two codes may be needed to describe the condition fully. Whether S31.805A is sequenced first depends on the reason for the encounter.
How long has S31.805A existed?
S31.805A has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.