ICDcodes.org
FY2027

K51.318 — Ulcerative (chronic) rectosigmoiditis with other complication

BillableCC

Is K51.318 billable?

Yes — K51.318 is billable for FY2027. K51.318 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K51.318 may be submitted for encounters from October 1, 2026 through September 30, 2027.

K51.318 at a glance

CodeK51.318
DescriptionUlcerative (chronic) rectosigmoiditis with other complication
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does K51.318 group to?

K51.318 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, K51.318 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is K51.318 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to K51.318. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Rectosigmoiditis › ulcerative › with › complication › specified NEC

Excludes1 — never code together — inherited from K50-K52

The conditions below can never be reported together with K51.318 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 K51.318 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 K51.318 to fully describe the condition. K51.318 is sequenced first.

  • code to identify any associated fistulas, if applicable:
  • anal fistula (K60.3-)
  • anorectal fistula (K60.5-)
  • rectal fistula (K60.4-)
  • code to identify manifestations, such as:
  • pyoderma gangrenosum (L88)

Excludes2 — not included here — inherited from Chapter 11

The conditions below are not part of K51.318, but a patient may have both at the same time. When documentation supports it, K51.318 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 K51.318 existed?

K51.318 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.

Which conditions are coded to K51.318?

What other codes are in the K51.31 family? (5)