K51.30
BillableUlcerative (chronic) rectosigmoiditis without complications
HCC Category Mapping
V28HCC 81 — Ulcerative Colitis
0.000V24HCC 35 — Inflammatory Bowel Disease
0.289ESRDHCC 35 — Inflammatory Bowel Disease
0.000RxHCCHCC 67 — Inflammatory Bowel Disease
0.000What This Code Means
Chronic inflammation with ulcers affecting both the rectum and sigmoid colon (lower portions of the large intestine) without any additional complications.
Coding Tips
- •Confirm documentation specifies both rectum and sigmoid colon involvement
- •Use only when no complications such as bleeding, obstruction, or fistula are present
Clinical Significance
Ulcerative rectosigmoiditis without complications represents inflammation confined to the rectum and sigmoid colon — a moderately limited form of ulcerative colitis. This intermediate extent is clinically significant as it indicates disease beyond the rectum but not involving the entire colon, affecting treatment approach and surveillance intervals.
Documentation Requirements
- ✓Confirmed ulcerative colitis involving both the rectum and sigmoid colon via colonoscopy
- ✓Biopsy confirmation of ulcerative colitis histopathology
- ✓Documentation that inflammation does not extend beyond the sigmoid colon
- ✓Statement confirming no complications are present
- ✓Current treatment regimen and disease management plan
- ✓Colonoscopy surveillance schedule documentation
Commonly Confused Codes
K51.30 vs K51.20 — K51.20 is proctitis (rectum only); rectosigmoiditis extends to include the sigmoid colonK51.30 vs K51.50 — K51.50 is left-sided colitis, which extends further to the descending colonK51.30 vs K51.00 — K51.00 is pancolitis (entire colon); rectosigmoiditis is more limitedK51.30 vs K52.9 — K52.9 is noninfective colitis unspecified; use K51.30 when ulcerative colitis is confirmed
Code Hierarchy
└K51Ulcerative colitis└K51.3Ulcerative (chronic) rectosigmoiditis└K51.30Ulcerative (chronic) rectosigmoiditis without complications
└K51.30Ulcerative (chronic) rectosigmoiditis without complications