Coding and coverage · ICD-10-CM

F16

F16.9 Hallucinogen use, unspecified

Not billable (header)Chapter 5

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

  • F16.90 Hallucinogen use, unspecified, uncomplicated
  • F16.91 Hallucinogen use, unspecified, in remission
  • F16.92 Hallucinogen use, unspecified with intoxicationHeader
  • F16.94 Hallucinogen use, unspecified with hallucinogen-induced mood disorder
  • F16.95 Hallucinogen use, unspecified with hallucinogen-induced psychotic disorderHeader
  • F16.98 Hallucinogen use, unspecified with other specified hallucinogen-induced disorderHeader
  • F16.99 Hallucinogen use, unspecified with unspecified hallucinogen-induced disorder

Instructional notes

Chapter 5

Excludes2Not included here: the patient may have both; report both when both are present.
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Includes
  • disorders of psychological development

F16

Includes
  • ecstasy
  • PCP
  • phencyclidine

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

Chapter 5: Mental, Behavioral and Neurodevelopmental disorders · F10-F19 Mental and behavioral disorders due to psychoactive substance use (F10-F19)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.