ICD-10-CM 2027
ICD-10 code for Posthallucinogen perception disorder
Hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks)
From the official ICD-10-CM alphabetic index entry “Disorder (of) › posthallucinogen perception”. Page updated September 29, 2026.
About coding Posthallucinogen perception disorder
The ICD-10-CM code for Posthallucinogen perception disorder is F16.983 (Hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks)). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F16.983.
Within F16.98 (hallucinogen use, unspecified with other specified hallucinogen-induced disorder), F16.983 is specifically for hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks). Related codes cover hallucinogen-induced anxiety disorder (F16.980) and other hallucinogen-induced disorder (F16.988).
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 894 (Alcohol, Drug Abuse or Dependence, Left AMA, relative weight 0.6275), DRG 895 (Alcohol, Drug Abuse or Dependence with Rehabilitation Therapy, relative weight 1.4266), DRG 896 (Alcohol, Drug Abuse or Dependence without Rehabilitation Therapy with MCC, relative weight 1.6617) and DRG 897 (Alcohol, Drug Abuse or Dependence without Rehabilitation Therapy without MCC, relative weight 0.8584), in MDC 20 (Alcohol/Drug Use and Alcohol/Drug Induced Organic Mental 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 Posthallucinogen perception disorder codes (official index)
Common questions about Posthallucinogen perception disorder ICD-10 codes
What is the ICD-10 code for Posthallucinogen perception disorder?
- F16.983 — Hallucinogen use, unspecified with hallucinogen persisting perception disorder (flashbacks). More specific codes apply when the documentation supports them: F16.183, F16.283.
Is F16.983 billable?
- Yes. F16.983 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F16.983 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F16.983 as a principal diagnosis.
Is F16.983 a CC or MCC?
- No. F16.983 is neither a CC nor an MCC under MS-DRG v44.0.