K58.9 Irritable bowel syndrome, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Irritable bowel syndrome NOS

Applies from K58 Irritable bowel syndrome

Includes

• irritable colon
• spastic colon

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 564.1 Irritable bowel syndrome (approximate)

Code annotations containing back-references to K58.9

Back-references to K58

• Code First: F54 Psychological and behavioral factors associated with disorders or diseases classified elsewhere ("mucous colitis (K58.-)")

Diagnosis Index entries for K58.9

• Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › mucous
• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › spastic
• Hypermobility, hypermotility › ileum
• Hypermobility, hypermotility › intestine
• Irritable, irritability › bowel (syndrome)
• Irritable, irritability › without diarrhea
• Irritable, irritability › colon
• Spasm (s), spastic, spasticity › colon
• Spasm (s), spastic, spasticity › intestinal
• Spasm (s), spastic, spasticity › sigmoid
• Syndrome › irritable › bowel

Nearby codes

• K58 Irritable bowel syndrome
• K58.0 Irritable bowel syndrome with diarrhea
• K58.1 Irritable bowel syndrome with constipation
• K58.2 Mixed irritable bowel syndrome
• K58.8 Other irritable bowel syndrome
• K58.9 Irritable bowel syndrome, unspecified (this code)