K51.311 – Ulcerative (chronic) rectosigmoiditis with rectal bleeding

ICD-10-CM 2027 diagnosis code · Noninfective enteritis and colitis

Billable code

ICD-10-CM code K51.311

Code: K51.311 (claims format: K51311)
Description: Ulcerative (chronic) rectosigmoiditis with rectal bleeding
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K50-K52 Noninfective enteritis and colitis
Parent codes: K51 › K51.3 › K51.31

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K51 – Ulcerative colitis

Excludes1 (not coded here):

Crohn's disease [regional enteritis] (K50.-)

Use additional code:

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)

Block K50-K52

Includes:

noninfective inflammatory bowel disease

Excludes1 (not coded here):

irritable bowel syndrome (K58.-)
megacolon (K59.3-)

Index terms for K51.311

Entries in the ICD-10-CM alphabetic index that lead to this code:

Rectosigmoiditis, ulcerative, with, complication, rectal bleeding

Related codes in K51.31

Frequently asked questions

What is ICD-10 code K51.311?

K51.311 is the ICD-10-CM code for ulcerative (chronic) rectosigmoiditis with rectal bleeding, in the block K50-K52 (Noninfective enteritis and colitis).

Is K51.311 a billable code?

Yes. K51.311 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K51.311 belong to?

It belongs to category K51 – Ulcerative colitis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.