ICD-10-CM 2027
ICD-10 code for Obsession
From the official ICD-10-CM alphabetic index entry “Obsession, obsessional state”. Page updated September 29, 2026.
About coding Obsession
The ICD-10-CM code for Obsession is F42.8 (Other obsessive-compulsive disorder). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on F42.8.
Within F42, choose F42.8 (Other obsessive-compulsive disorder) only when documentation doesn't support a more specific option: mixed obsessional thoughts and acts (F42.2), Hoarding disorder (F42.3), Excoriation (skin-picking) disorder (F42.4) and unspecified (F42.9).
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 882 (Neuroses Except Depressive, relative weight 0.9952), in MDC 19 (Mental Diseases and Disorders), 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 Obsession codes (official index)
- mixed thoughts and acts F42.2 — Mixed obsessional thoughts and acts
Common questions about Obsession ICD-10 codes
What is the ICD-10 code for Obsession?
- F42.8 — Other obsessive-compulsive disorder. More specific codes apply when the documentation supports them: F42.2.
What is the ICD-10 code for mixed thoughts and acts obsession?
- F42.2 — Mixed obsessional thoughts and acts.
Is F42.8 billable?
- Yes. F42.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F42.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F42.8 as a principal diagnosis.
Is F42.8 a CC or MCC?
- No. F42.8 is neither a CC nor an MCC under MS-DRG v44.0.