ICD-10-CM 2027
ICD-10 code for constipation
Confirmed by the official ICD-10-CM index entry “constipation (atonic) (neurogenic) (simple) (spastic)”. Page updated September 29, 2026.
About coding constipation
The ICD-10-CM code for constipation is K59.00 (Constipation, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K59.00.
Within K59.0, choose K59.00 (unspecified) only when documentation doesn't support a more specific option: slow transit constipation (K59.01), outlet dysfunction constipation (K59.02), drug induced constipation (K59.03), chronic idiopathic constipation (K59.04) and other constipation (K59.09).
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.
Related Constipation codes
Common questions about constipation ICD-10 codes
What is the ICD-10 code for constipation?
- K59.00 — Constipation, unspecified. More specific codes apply when the documentation supports them: K59.01, K59.02, K59.03, K59.04 and others below.
What is the ICD-10 code for slow transit constipation?
- K59.01 — Slow transit constipation.
What is the ICD-10 code for outlet dysfunction constipation?
- K59.02 — Outlet dysfunction constipation.
What is the ICD-10 code for drug induced constipation?
- K59.03 — Drug induced constipation.
What is the ICD-10 code for chronic idiopathic constipation?
- K59.04 — Chronic idiopathic constipation.
What is the ICD-10 code for other constipation?
- K59.09 — Other constipation.
Is K59.00 billable?
- Yes. K59.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K59.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K59.00 as a principal diagnosis.
Is K59.00 a CC or MCC?
- No. K59.00 is neither a CC nor an MCC under MS-DRG v44.0.