ICD-10-CM 2027
ICD-10 code for chronic constipation
From the official ICD-10-CM alphabetic index entry “Constipation (atonic) (neurogenic) (simple) (spastic) › chronic”. Page updated September 29, 2026.
About coding chronic constipation
The ICD-10-CM code for chronic constipation is K59.09 (Other constipation). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on K59.09.
Within K59.0, choose K59.09 (Other constipation) only when documentation doesn't support a more specific option: unspecified (K59.00), slow transit constipation (K59.01), outlet dysfunction constipation (K59.02), drug induced constipation (K59.03) and chronic idiopathic constipation (K59.04).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific chronic constipation codes (official index)
- idiopathic K59.04 — Chronic idiopathic constipation
Common questions about chronic constipation ICD-10 codes
What is the ICD-10 code for chronic constipation?
- K59.09 — Other constipation. More specific codes apply when the documentation supports them: K59.04.
What is the ICD-10 code for idiopathic chronic constipation?
- K59.04 — Chronic idiopathic constipation.
Is K59.09 billable?
- Yes. K59.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K59.09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K59.09 as a principal diagnosis.
Is K59.09 a CC or MCC?
- No. K59.09 is neither a CC nor an MCC under MS-DRG v44.0.