F16.921
BillableHallucinogen use, unspecified with intoxication with delirium
HCC Category Mapping
V28HCC 137 — Drug Use Disorder/Substance Use Disorder, Moderate/Severe
0.358V24HCC 55 — Drug/Alcohol Dependence
0.334ESRDHCC 55 — Drug/Alcohol Dependence
0.000What This Code Means
A person uses hallucinogenic drugs and experiences severe confusion and disorientation (delirium) from the intoxication.
Coding Tips
- •Delirium is a serious acute mental state requiring immediate clinical attention and documentation
- •Document the specific symptoms of delirium such as confusion, disorientation, and altered consciousness
Clinical Significance
Hallucinogen use with intoxication delirium represents an acute psychiatric emergency where the patient has altered consciousness, confusion, and disorientation from hallucinogen intoxication. This code captures the severity of the acute presentation and justifies emergency-level care regardless of whether the use pattern meets abuse or dependence criteria.
Documentation Requirements
- ✓Documentation of hallucinogen use (pattern unspecified)
- ✓Clinical evidence of delirium: acute confusion, disorientation, fluctuating consciousness
- ✓Temporal link to hallucinogen use
- ✓Mental status examination documenting delirium findings
- ✓Medical workup excluding other delirium etiologies
- ✓Monitoring and treatment plan for acute delirium
Commonly Confused Codes
F16.920 — Hallucinogen use with intoxication, uncomplicated; use when NO delirium is presentF16.221 — Hallucinogen dependence with intoxication delirium; use when dependence is documentedF16.121 — Hallucinogen abuse with intoxication delirium; use when abuse is documentedF05 — Delirium due to known physiological condition; use for non-substance-induced delirium
Code Hierarchy
└F16Hallucinogen related disorders└F16.9Hallucinogen use, unspecified└F16.92Hallucinogen use, unspecified with intoxication└F16.921Hallucinogen use, unspecified with intoxication with delirium
└F16.921Hallucinogen use, unspecified with intoxication with delirium