F16.121 — Hallucinogen abuse with intoxication with delirium
Is F16.121 billable?
Yes — F16.121 is billable for FY2027. F16.121 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. F16.121 may be submitted for encounters from October 1, 2026 through September 30, 2027.
F16.121 at a glance
| Code | F16.121 |
|---|---|
| Description | Hallucinogen abuse with intoxication with delirium |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does F16.121 group to?
F16.121 sits in MDC 20 and helps define the logic of 4 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 894Alcohol, Drug Abuse or Dependence, Left AMAmedical
- 895Alcohol, Drug Abuse or Dependence with Rehabilitation Therapymedical
- 896Alcohol, Drug Abuse or Dependence without Rehabilitation Therapy with MCCmedical
- 897Alcohol, Drug Abuse or Dependence without Rehabilitation Therapy without MCCmedical
As a secondary diagnosis, F16.121 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is F16.121 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to F16.121. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Delirium, delirious › due to › hallucinogen intoxication › in › abuse (acute or subacute) (not alcohol- or drug-induced)
- Delirium, delirious › due to › phencyclidine intoxication › in › abuse (acute or subacute) (not alcohol- or drug-induced)
- Disorder › hallucinogen use › mild › with › hallucinogen intoxication delirium (of)
- Disorder › phencyclidine use › mild › with › phencyclidine intoxication delirium (of)
- Abuse › drug NEC › hallucinogen › with › intoxication › with › delirium
Excludes1 — never code together — inherited from F16.1
The conditions below can never be reported together with F16.121 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F16.121, but a patient may have both at the same time. When documentation supports it, F16.121 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
How long has F16.121 existed?
F16.121 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.