What is ICD-10 code F10.99?

F10.99 is the ICD-10-CM diagnosis code for Alcohol use, unspecified with unspecified alcohol-induced disorder. A person has a pattern of alcohol use that is causing problems, but the specific type of alcohol-related disorder is not clearly documented or specified. F10.99 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F10.99 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F10.99 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F10.99 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does F10.99 map to under V28?

F10.99 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for F10.99?

F10.99 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for F10.99?

F10.99 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports F10.99?

Use this code only when the specific alcohol-induced disorder cannot be determined from documentation Review clinical notes to see if a more specific F10 code (such as F10.10 for dependence or F10.20 for other disorders) would be more appropriate F10.99 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Can F10.99 be a primary diagnosis?

Yes. F10.99 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Which codes cannot be reported with F10.99?

The Excludes1 note that applies to F10.99 lists alcohol abuse (F10.1-); alcohol dependence (F10.2-). An Excludes1 condition is not reported together with F10.99; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99); those are separate conditions that may be reported together with F10.99 when both are documented.

2026 ICD-10-CM F10.99: Alcohol use, unspecified

F10.99 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupF10.99

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)

F10.99

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

Alcohol use, unspecified with unspecified alcohol-induced disorder

A person has a pattern of alcohol use that is causing problems, but the specific type of alcohol-related disorder is not clearly documented or specified.

Buddy Insight

Alcohol use, unspecified with unspecified alcohol-induced disorder is the least specific code in the alcohol-induced disorder category.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

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

N/A

—

Not risk-adjusted for this model/period.

Not mapped

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

No inclusion terms are included in this display for F10.99. Check the code and parent instructions in the Code Book.

Excludes 2

Official

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

Related Codes

Official

F10.90Alcohol use, unspecified, uncomplicated F10.91Alcohol use, unspecified, in remission F10.92Alcohol use, unspecified with intoxication F10.93Alcohol use, unspecified with withdrawal F10.94Alcohol use, unspecified with alcohol-induced mood disorder

Includes

Official

disorders of psychological developmentInherited from F01-F99

Excludes 1

Official

alcohol abuse (F10.1-)Inherited from F10.9
alcohol dependence (F10.2-)Inherited from F10.9

Code First

Official

No Code First sequencing instructions are included in this display for F10.99. Check the code and parent instructions in the Code Book.

Use Additional

Official

code for blood alcohol level, if applicable (Y90.-)Inherited from F10

Code Also

Official

No Code Also instructions are included in this display for F10.99. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of an alcohol-related disorder, even if not further specified

Evidence of alcohol use contributing to the health problem

Documentation supporting why a more specific code cannot be assigned

Assessment of alcohol use pattern (ideally to classify as abuse or dependence)

MEAT Support

HCC Buddy guidance

Provider documentation of an alcohol-related disorder, even if not further specified

Evidence of alcohol use contributing to the health problem

Documentation supporting why a more specific code cannot be assigned

Assessment of alcohol use pattern (ideally to classify as abuse or dependence)

Audit Caution

HCC Buddy guidance

Defaulting to this code without attempting to query the provider for more specificity

Using this code when the record contains enough detail to support a more specific F10 code

Confusing unspecified use with abuse or dependence — each has distinct clinical criteria

Not recognizing that this code drops out of HCC mapping in V28, potentially losing risk adjustment value

Common Mistakes

HCC Buddy guidance

F10.10 — Alcohol abuse, uncomplicated: use when abuse is documented without a specific induced disorder

F10.20 — Alcohol dependence, uncomplicated: use when dependence is documented

F10.988 — Alcohol use, unspecified with other alcohol-induced disorder: use when the specific disorder is identified but has no unique code

Z72.89 — Other problems related to lifestyle (alcohol use): use for non-pathological alcohol use

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 F10.99 an HCC code?

F10.99 is not in the CMS-HCC V28 or V24 community payment model. F10.99 has a separate mapping under the CMS-HCC ESRD model (HCC 55 (Substance Use Disorder/Moderate/Severe/Substance Use with Complications)); the applicable result needs member context.

Code: F10.99
Description: Alcohol use, unspecified with unspecified alcohol-induced disorder
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

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 F10.99 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for F10.99

For F10.99, 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

F10.99 is the ICD-10-CM diagnosis code for alcohol use, unspecified with unspecified alcohol-induced disorder. A person has a pattern of alcohol use that is causing problems, but the specific type of alcohol-related disorder is not clearly documented or specified. F10.99 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).

F10.99 has no mapping under the CMS-HCC V28 or V24 community payment models. F10.99 has a separate mapping under the CMS-HCC ESRD model (HCC 55 (Substance Use Disorder/Moderate/Severe/Substance Use with Complications)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

Use this code only when the specific alcohol-induced disorder cannot be determined from documentation.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for F10.99 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the specific alcohol-induced disorder cannot be determined from documentation
•Review clinical notes to see if a more specific F10 code (such as F10.10 for dependence or F10.20 for other disorders) would be more appropriate

Clinical Significance

Alcohol use, unspecified with unspecified alcohol-induced disorder is the least specific code in the alcohol-induced disorder category. It indicates an alcohol-related health problem exists but neither the use pattern nor the specific disorder is documented. This represents a significant documentation improvement opportunity and should trigger a provider query whenever possible.

Documentation Requirements

✓Provider documentation of an alcohol-related disorder, even if not further specified
✓Evidence of alcohol use contributing to the health problem
✓Documentation supporting why a more specific code cannot be assigned
✓Assessment of alcohol use pattern (ideally to classify as abuse or dependence)

Commonly Confused Codes

•F10.10: Alcohol abuse, uncomplicated: use when abuse is documented without a specific induced disorder
•F10.20: Alcohol dependence, uncomplicated: use when dependence is documented
•F10.988: Alcohol use, unspecified with other alcohol-induced disorder: use when the specific disorder is identified but has no unique code
•Z72.89: Other problems related to lifestyle (alcohol use): use for non-pathological alcohol use