ICD-10 · PDGM grouping

K55-K64 — Other diseases of intestines

Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.

OASIS-E2 v1.00.0 · ingested 2026-04-26

Codes in range

157

No clinical group

A period cannot be grouped from these.

Barred as primary

CMS rejects these in the primary position.

Where these codes group

134 of the 157 codes in K55-K64 group to MMTA - Gastrointestinal tract and Genitourinary system, but the range is not uniform — it spreads across 2 clinical groups. A further 5 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.

Every code in K55-K64

Descriptions are CMS’s own, abbreviated as CMS abbreviates them.

Code	Description	Clinical group	Primary position
K55011	Focal (segmental) acute ischemia of small intestine	A	Accepted
K55012	Diffuse acute (reversible) ischemia of small intestine	A	Accepted
K55019	Acute ischemia of small intestine, extent unspecified	J	Accepted
K55021	Focal (segmental) acute infarction of small intestine	A	Accepted
K55022	Diffuse acute infarction of small intestine	A	Accepted
K55029	Acute infarction of small intestine, extent unspecified	A	Accepted
K55031	Focal (segmental) acute ischemia of large intestine	J	Accepted
K55032	Diffuse acute (reversible) ischemia of large intestine	A	Accepted
K55039	Acute ischemia of large intestine, extent unspecified	J	Accepted
K55041	Focal (segmental) acute infarction of large intestine	A	Accepted
K55042	Diffuse acute infarction of large intestine	A	Accepted
K55049	Acute infarction of large intestine, extent unspecified	A	Accepted
K55051	Focal acute ischemia of intestine, part unspecified	A	Accepted
K55052	Diffuse acute ischemia of intestine, part unspecified	A	Accepted
K55059	Acute ischemia of intestine, part and extent unspecified	J	Accepted
K55061	Focal acute infarction of intestine, part unspecified	A	Accepted
K55062	Diffuse acute infarction of intestine, part unspecified	A	Accepted
K55069	Acute infarction of intestine, part and extent unspecified	J	Accepted
K551	Chronic vascular disorders of intestine	J	Accepted
K5520	Angiodysplasia of colon without hemorrhage	J	Accepted
K5521	Angiodysplasia of colon with hemorrhage	J	Accepted
K5530	Necrotizing enterocolitis, unspecified	A	Accepted
K5531	Stage 1 necrotizing enterocolitis	A	Accepted
K5532	Stage 2 necrotizing enterocolitis	A	Accepted
K5533	Stage 3 necrotizing enterocolitis	A	Accepted
K558	Other vascular disorders of intestine	J	Accepted
K559	Vascular disorder of intestine, unspecified	J	Accepted
K560	Paralytic ileus	J	Accepted
K561	Intussusception	J	Accepted
K562	Volvulus	J	Accepted
K563	Gallstone ileus	J	Accepted
K5641	Fecal impaction	J	Accepted
K5649	Other impaction of intestine	J	Accepted
K5650	Intestnl adhesions, unsp as to partial versus complete obst	J	Accepted
K5651	Intestinal adhesions [bands], with partial obstruction	J	Accepted
K5652	Intestinal adhesions [bands] with complete obstruction	J	Accepted
K56600	Partial intestinal obstruction, unspecified as to cause	None	Cannot group
K56601	Complete intestinal obstruction, unspecified as to cause	None	Cannot group
K56609	Unsp intestnl obst, unsp as to partial versus complete obst	None	Cannot group
K56690	Other partial intestinal obstruction	J	Accepted
K56691	Other complete intestinal obstruction	J	Accepted
K56699	Other intestnl obst unsp as to partial versus complete obst	J	Accepted
K567	Ileus, unspecified	J	Accepted
K5700	Dvtrcli of sm int w perforation and abscess w/o bleeding	J	Accepted
K5701	Dvtrcli of sm int w perforation and abscess w bleeding	J	Accepted
K5710	Dvrtclos of sm int w/o perforation or abscess w/o bleeding	J	Accepted
K5711	Dvrtclos of sm int w/o perforation or abscess w bleeding	J	Accepted
K5712	Dvtrcli of sm int w/o perforation or abscess w/o bleeding	J	Accepted
K5713	Dvtrcli of sm int w/o perforation or abscess w bleeding	J	Accepted
K5720	Dvtrcli of lg int w perforation and abscess w/o bleeding	J	Accepted
K5721	Dvtrcli of lg int w perforation and abscess w bleeding	J	Accepted
K5730	Dvrtclos of lg int w/o perforation or abscess w/o bleeding	J	Accepted
K5731	Dvrtclos of lg int w/o perforation or abscess w bleeding	J	Accepted
K5732	Dvtrcli of lg int w/o perforation or abscess w/o bleeding	J	Accepted
K5733	Dvtrcli of lg int w/o perforation or abscess w bleeding	J	Accepted
K5740	Dvtrcli of both small and lg int w perf and abscs w/o bleed	J	Accepted
K5741	Dvtrcli of both small and lg int w perf and abscess w bleed	J	Accepted
K5750	Dvrtclos of both sm and lg int w/o perf or abscs w/o bleed	J	Accepted
K5751	Dvrtclos of both small and lg int w/o perf or abscs w bleed	J	Accepted
K5752	Dvtrcli of both small and lg int w/o perf or abscs w/o bleed	J	Accepted
K5753	Dvtrcli of both small and lg int w/o perf or abscess w bleed	J	Accepted
K5780	Dvtrcli of intest, part unsp, w perf and abscess w/o bleed	J	Accepted
K5781	Dvtrcli of intest, part unsp, w perf and abscess w bleeding	J	Accepted
K5790	Dvrtclos of intest, part unsp, w/o perf or abscess w/o bleed	J	Accepted
K5791	Dvrtclos of intest, part unsp, w/o perf or abscess w bleed	J	Accepted
K5792	Dvtrcli of intest, part unsp, w/o perf or abscess w/o bleed	J	Accepted
K5793	Dvtrcli of intest, part unsp, w/o perf or abscess w bleeding	J	Accepted
K580	Irritable bowel syndrome with diarrhea	J	Accepted
K581	Irritable bowel syndrome with constipation	J	Accepted
K582	Mixed irritable bowel syndrome	J	Accepted
K588	Other irritable bowel syndrome	J	Accepted
K589	Irritable bowel syndrome, unspecified	J	Accepted
K5900	Constipation, unspecified	J	Accepted
K5901	Slow transit constipation	J	Accepted
K5902	Outlet dysfunction constipation	J	Accepted
K5903	Drug induced constipation	J	Accepted
K5904	Chronic idiopathic constipation	J	Accepted
K5909	Other constipation	J	Accepted
K591	Functional diarrhea	J	Accepted
K592	Neurogenic bowel, not elsewhere classified	J	Accepted
K5931	Toxic megacolon	J	Accepted
K5939	Other megacolon	J	Accepted
K594	Anal spasm	J	Accepted
K5981	Ogilvie syndrome	J	Accepted
K5989	Other specified functional intestinal disorders	J	Accepted
K599	Functional intestinal disorder, unspecified	J	Accepted
K600	Acute anal fissure	J	Accepted
K601	Chronic anal fissure	J	Accepted
K602	Anal fissure, unspecified	J	Accepted
K6030	Anal fistula, unspecified	J	Accepted
K60311	Anal fistula, simple, initial	J	Accepted
K60312	Anal fistula, simple, persistent	J	Accepted
K60313	Anal fistula, simple, recurrent	J	Accepted
K60319	Anal fistula, simple, unspecified	J	Accepted
K60321	Anal fistula, complex, initial	J	Accepted
K60322	Anal fistula, complex, persistent	J	Accepted
K60323	Anal fistula, complex, recurrent	J	Accepted
K60329	Anal fistula, complex, unspecified	J	Accepted
K6040	Rectal fistula, unspecified	J	Accepted
K60411	Rectal fistula, simple, initial	J	Accepted
K60412	Rectal fistula, simple, persistent	J	Accepted
K60413	Rectal fistula, simple, recurrent	J	Accepted
K60419	Rectal fistula, simple, unspecified	J	Accepted
K60421	Rectal fistula, complex, initial	J	Accepted
K60422	Rectal fistula, complex, persistent	J	Accepted
K60423	Rectal fistula, complex, recurrent	J	Accepted
K60429	Rectal fistula, complex, unspecified	J	Accepted
K6050	Anorectal fistula, unspecified	J	Accepted
K60511	Anorectal fistula, simple, initial	J	Accepted
K60512	Anorectal fistula, simple, persistent	J	Accepted
K60513	Anorectal fistula, simple, recurrent	J	Accepted
K60519	Anorectal fistula, simple, unspecified	J	Accepted
K60521	Anorectal fistula, complex, initial	J	Accepted
K60522	Anorectal fistula, complex, persistent	J	Accepted
K60523	Anorectal fistula, complex, recurrent	J	Accepted
K60529	Anorectal fistula, complex, unspecified	J	Accepted
K610	Anal abscess	J	Accepted
K611	Rectal abscess	J	Accepted
K612	Anorectal abscess	J	Accepted
K6131	Horseshoe abscess	J	Accepted
K6139	Other ischiorectal abscess	J	Accepted
K614	Intrasphincteric abscess	J	Accepted
K615	Supralevator abscess	J	Accepted
K620	Anal polyp	J	Accepted
K621	Rectal polyp	J	Accepted
K622	Anal prolapse	J	Accepted
K623	Rectal prolapse	J	Accepted
K624	Stenosis of anus and rectum	J	Accepted
K625	Hemorrhage of anus and rectum	J	Accepted
K626	Ulcer of anus and rectum	J	Accepted
K627	Radiation proctitis	J	Accepted
K6281	Anal sphincter tear (healed) (nontraumatic) (old)	A	Accepted
K6282	Dysplasia of anus	J	Accepted
K6289	Other specified diseases of anus and rectum	J	Accepted
K629	Disease of anus and rectum, unspecified	None	Cannot group
K630	Abscess of intestine	J	Accepted
K631	Perforation of intestine (nontraumatic)	J	Accepted
K632	Fistula of intestine	J	Accepted
K633	Ulcer of intestine	J	Accepted
K634	Enteroptosis	J	Accepted
K635	Polyp of colon	J	Accepted
K6381	Dieulafoy lesion of intestine	J	Accepted
K638211	Small intestinal bacterial overgrowth, hydrogen-subtype	J	Accepted
K638212	Small intestnl bact overgrowth, hydrogen sulfide-subtype	J	Accepted
K638219	Small intestinal bacterial overgrowth, unspecified	J	Accepted
K63822	Small intestinal fungal overgrowth	J	Accepted
K63829	Intestinal methanogen overgrowth, unspecified	J	Accepted
K6389	Other specified diseases of intestine	J	Accepted
K639	Disease of intestine, unspecified	None	Cannot group
K640	First degree hemorrhoids	J	Accepted
K641	Second degree hemorrhoids	J	Accepted
K642	Third degree hemorrhoids	J	Accepted
K643	Fourth degree hemorrhoids	J	Accepted
K644	Residual hemorrhoidal skin tags	J	Accepted
K645	Perianal venous thrombosis	J	Accepted
K648	Other hemorrhoids	J	Accepted
K649	Unspecified hemorrhoids	J	Accepted

Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.

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K55-K64 — Other diseases of intestines

Where these codes group

Every code in K55-K64

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