F18.24 maps to CMS-HCC V28 137. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupF18.24

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Mental and behavioral disorders due to psychoactive substance use (F10-F19)

F18.24

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Inhalant dependence with inhalant-induced mood disorder

A person who is dependent on inhalants and has developed a mood disorder (such as depression or bipolar disorder) directly caused by the inhalant use.

Buddy Insight

Inhalant dependence with induced mood disorder captures chronic inhalant users who have developed depression, mania, or emotional dysregulation directly caused by neurotoxic effects of inhalants.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 137

Drug Use Disorder, Moderate/S...

Coefficient HCC 137: 0.424 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 082

HHS-HCC 082 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 55

Substance Use Disorder/Modera...

Code-level coefficient reference

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

Inclusion Terms

Official

Inhalant use disorder, moderate, with inhalant induced depressive disorder
Inhalant use disorder, severe, with inhalant induced depressive disorder

Excludes 2

Official

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)Inherited from F01-F99

Related Codes

Official

F18.20Inhalant dependence, uncomplicated F18.21Inhalant dependence, in remission F18.22Inhalant dependence with intoxication F18.25Inhalant dependence with inhalant-induced psychotic disorder F18.27Inhalant dependence with inhalant-induced dementia

Includes

Official

disorders of psychological developmentInherited from F01-F99, F18
volatile solventsInherited from F01-F99, F18

Excludes 1

Official

inhalant abuse (F18.1-)Inherited from F18.2
inhalant use, unspecified (F18.9-)Inherited from F18.2

Code First

Official

No Code First sequencing instructions are included in this display for F18.24. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for F18.24. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for F18.24. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of inhalant dependence

Specific mood symptoms (depressive, manic, irritable, mixed)

Provider statement linking mood disturbance to inhalant use

Neuropsychological assessment if available

MEAT Support

HCC Buddy guidance

Documentation of inhalant dependence

Specific mood symptoms (depressive, manic, irritable, mixed)

Provider statement linking mood disturbance to inhalant use

Neuropsychological assessment if available

Audit Caution

HCC Buddy guidance

Coding primary mood disorder instead of substance-induced mood disorder

Not establishing the causal link to inhalant use

Using a separate mood disorder code alongside the substance-induced code

Missing the mood disorder and coding only uncomplicated dependence

Common Mistakes

HCC Buddy guidance

F18.14 — Inhalant abuse with induced mood disorder; use when abuse rather than dependence

F18.280 — Inhalant dependence with induced anxiety; anxiety and mood are different

F32.9 — Major depressive disorder, unspecified; use for primary depression

F18.20 — Inhalant dependence, uncomplicated; use when no induced disorder present

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is F18.24 an HCC code?

Yes. F18.24 (Inhalant dependence with inhalant-induced mood disorder) maps to HCC 137, Drug Use Disorder, Moderate/Severe, or Drug Use with Non-Psychotic Complications under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.424. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: F18.24 is billable and maps to V28 HCC 137, Drug Use Disorder, Moderate/Severe, or Drug Use with Non-Psychotic Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: F18.24
Description: Inhalant dependence with inhalant-induced mood disorder
HCC (V28): HCC 137 — Drug Use Disorder, Moderate/Severe, or Drug Use with Non-Psychotic Complications
RAF reference coefficient: 0.424
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 137, Drug Use Disorder, Moderate/Severe, or Drug Use with Non-Psychotic Complications

0.424

ESRDHCC 55, Substance Use Disorder/Moderate/Severe/Substance Use with Complications

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work F18.24 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for F18.24

For F18.24, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

F18.24 is the ICD-10-CM diagnosis code for inhalant dependence with inhalant-induced mood disorder. A person who is dependent on inhalants and has developed a mood disorder (such as depression or bipolar disorder) directly caused by the inhalant use. F18.24 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering mental and behavioral disorders due to psychoactive substance use (f10-f19).

Under the CMS-HCC V28 risk adjustment model, F18.24 maps to Drug Use Disorder, Moderate/Severe, or Drug Use with Non-Psychotic Complications (HCC 137) with a source-labeled community, non-dual, aged reference coefficient of 0.424. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Ensure the mood disorder is documented as inhalant-induced rather than a primary psychiatric condition. For F18.24, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for F18.24 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Ensure the mood disorder is documented as inhalant-induced rather than a primary psychiatric condition
•Consider the temporal relationship between inhalant use and mood disorder onset

Clinical Significance

Inhalant dependence with induced mood disorder captures chronic inhalant users who have developed depression, mania, or emotional dysregulation directly caused by neurotoxic effects of inhalants. Toluene and other solvents damage frontal lobe white matter, producing mood disturbances that may persist even after cessation.

Documentation Requirements

✓Documentation of inhalant dependence
✓Specific mood symptoms (depressive, manic, irritable, mixed)
✓Provider statement linking mood disturbance to inhalant use
✓Neuropsychological assessment if available
✓Brain imaging findings when available (white matter changes)
✓Treatment plan addressing both dependence and mood disorder

Commonly Confused Codes

•F18.14: Inhalant abuse with induced mood disorder; use when abuse rather than dependence
•F18.280: Inhalant dependence with induced anxiety; anxiety and mood are different
•F32.9: Major depressive disorder, unspecified; use for primary depression
•F18.20: Inhalant dependence, uncomplicated; use when no induced disorder present