S31.051A — Open bite of lower back and pelvis with penetration into retroperitoneum, initial encounter
Is S31.051A billable?
Yes — S31.051A is billable for FY2027. S31.051A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S31.051A may be submitted for encounters from October 1, 2026 through September 30, 2027.
S31.051A at a glance
| Code | S31.051A |
|---|---|
| Description | Open bite of lower back and pelvis with penetration into retroperitoneum, 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 S31.051A?
In S31.051A, the 7th character A means initial encounter. The 7th character is required for S31.051A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S31.051A group to?
S31.051A sits in MDC 11 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 698Other Kidney and Urinary Tract Diagnoses with MCCmedical
- 699Other Kidney and Urinary Tract Diagnoses with CCmedical
- 700Other Kidney and Urinary Tract Diagnoses without CC/MCCmedical
As a secondary diagnosis, S31.051A is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is S31.051A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S31.051, the nearest indexed parent of S31.051A. Use them to find the family, then select the specific code.
- Bite › pelvis › with penetration into retroperitoneal space (s) (animal) (human)
- Bite › back › lower › with penetration into retroperitoneal space (s) (animal) (human)
Excludes1 — never code together — inherited from S31
The conditions below can never be reported together with S31.051A 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 S31.05
The conditions below can never be reported together with S31.051A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 19
Report an additional code alongside S31.051A to fully describe the condition. S31.051A 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 S31.051A, but a patient may have both at the same time. When documentation supports it, S31.051A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S30-S39
The conditions below are not part of S31.051A, but a patient may have both at the same time. When documentation supports it, S31.051A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S31
The conditions below are not part of S31.051A, but a patient may have both at the same time. When documentation supports it, S31.051A and the excluded code may both be reported.
Code also — inherited from S31
Two codes may be needed to describe the condition fully. Whether S31.051A is sequenced first depends on the reason for the encounter.
How long has S31.051A existed?
S31.051A 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.