K51.21
⚠ Non-billable
Ulcerative (chronic) proctitis with complications
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K51.21
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code K51.21?
ICD-10-CM code K51.21 represents Ulcerative (chronic) proctitis with complications. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K51.21 billable?
No. K51.21 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K51.21 in?
K51.21 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K51 category
K51
Ulcerative colitis
Non-billable
K51.0
Ulcerative (chronic) pancolitis
Non-billable
K51.2
Ulcerative (chronic) proctitis
Non-billable
K51.3
Ulcerative (chronic) rectosigmoiditis
Non-billable
K51.4
Inflammatory polyps of colon
Non-billable
K51.5
Left sided colitis
Non-billable
K51.8
Other ulcerative colitis
Non-billable
K51.9
Ulcerative colitis, unspecified
Non-billable
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