K51.813 — Other ulcerative colitis with fistula
Is K51.813 billable?
Yes — K51.813 is billable for FY2027. K51.813 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K51.813 may be submitted for encounters from October 1, 2026 through September 30, 2027.
K51.813 at a glance
| Code | K51.813 |
|---|---|
| Description | Other ulcerative colitis with fistula |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does K51.813 group to?
K51.813 sits in MDC 06 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.
- 385Inflammatory Bowel Disease with MCCmedical
- 386Inflammatory Bowel Disease with CCmedical
- 387Inflammatory Bowel Disease without CC/MCCmedical
As a secondary diagnosis, K51.813 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is K51.813 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K51.813. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Colitis › ulcerative › specified type NEC › with › complication › fistula (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)
Excludes1 — never code together — inherited from K50-K52
The conditions below can never be reported together with K51.813 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 K51
The conditions below can never be reported together with K51.813 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Crohn's disease [regional enteritis] (K50.-)
Use additional code — inherited from K51
Report an additional code alongside K51.813 to fully describe the condition. K51.813 is sequenced first.
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K51.813, but a patient may have both at the same time. When documentation supports it, K51.813 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has K51.813 existed?
K51.813 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.