What is ICD-10 code F31.10?

F31.10 is the ICD-10-CM diagnosis code for Bipolar disorder, current episode manic without psychotic features, unspecified. Bipolar disorder with a current manic episode that is not severe enough to include psychotic features, but the specific severity level (mild, moderate, or severe) is not documented. F31.10 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F31.10 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. F31.10 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. F31.10 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 F31.10 map to under V28?

F31.10 maps to CMS-HCC V28 154 (Bipolar Disorders without Psychosis). The category number and label come from the CMS-HCC V28 model file for payment year 2026.

What does F31.10 pay in RAF?

F31.10 carries a community, non-dual, aged (CNA) RAF weight of 0.351 under CMS-HCC V28 for payment year 2026. The weight comes from the CMS V28 relative-factor file, not a hand-typed table.

What is the V28 vs V24 difference for F31.10?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For F31.10, V28 maps to Bipolar Disorders without Psychosis at RAF 0.351 while V24 mapped to Major Depressive, Bipolar, and Paranoid Disorders at RAF 0.309. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports F31.10?

This unspecified code should be used only when severity cannot be determined from documentation Review clinical notes for descriptions of functional impairment, sleep disruption, and behavioral changes to determine appropriate severity level Because F31.10 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM F31.10: Bipolar disorder, current

F31.10 maps to CMS-HCC V28 154 (RAF 0.351). Documentation must support MEAT. MEAT criteria · RAF calculator · HCC coding software

ICD-10-CM Code View

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Code lookupF31.10Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Mood [affective] disorders (F30-F39)

F31.10

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

Bipolar disorder, current episode manic without psychotic features, unspecified

Bipolar disorder with a current manic episode that is not severe enough to include psychotic features, but the specific severity level (mild, moderate, or severe) is not documented.

Buddy Insight

Bipolar disorder with current manic episode without psychotic features where severity is unspecified indicates an active manic state requiring close monitoring and typically medication adjustment.

CMS-HCC V28

Mapped

HCC 154

Bipolar Disorders without Psy...

RAF 0.351

CMS-HCC V24

Mapped

HCC 59

Major Depressive, Bipolar, an...

RAF 0.309

ACA/HHS

Mapped

HCC 88

HHS-HCC 88

Varies by metal level

ESRD/PACE

Mapped

HCC 59

Major Depressive, Bipolar, an...

RAF 0.066

RXHCC

Mapped

HCC 131

Bipolar Disorders

RAF 0.240

Code Book Path

Official

F31Bipolar disorder

F31.1Bipolar disorder, current episode manic without psychotic features

F31.10Bipolar disorder, current episode manic without psychotic features, unspecified

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F31.10 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F31.10 in this effective period.

Related Child Codes

Official

F31.11Bipolar disorder, current episode manic without psychotic features, mild

F31.12Bipolar disorder, current episode manic without psychotic features, moderate

F31.13Bipolar disorder, current episode manic without psychotic features, severe

Includes

Official

ICD-10-CM does not list Includes notes for F31.10 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F31.10 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F31.10 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F31.10 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F31.10 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Confirmed diagnosis of bipolar disorder with documented history

Current manic episode symptoms described (elevated mood, grandiosity, decreased need for sleep, flight of ideas, increased activity)

Documentation that psychotic features are absent

Provider should ideally specify severity (mild, moderate, severe) — query if not documented

MEAT Support

HCC Buddy guidance

Confirmed diagnosis of bipolar disorder with documented history

Current manic episode symptoms described (elevated mood, grandiosity, decreased need for sleep, flight of ideas, increased activity)

Documentation that psychotic features are absent

Provider should ideally specify severity (mild, moderate, severe) — query if not documented

Audit Caution

HCC Buddy guidance

Defaulting to 'unspecified' severity when the provider has documented mild, moderate, or severe — always check for severity documentation

Confusing this with the hypomanic episode code F31.0 when the clinical presentation meets full manic criteria

Not querying the provider to specify severity, which results in less specific coding

Using this code for drug-induced manic symptoms instead of the appropriate substance use code

Common Mistakes

HCC Buddy guidance

F31.0 — Bipolar disorder, current episode hypomanic: Hypomania is a milder form that does not cause marked functional impairment

F31.2 — Bipolar disorder, current episode manic severe with psychotic features: Requires documented psychotic symptoms such as delusions or hallucinations

F31.11 — Same condition, mild severity: Use when provider specifically documents mild manic episode

F30.10 — Manic episode without psychotic features, unspecified: Use only for isolated manic episodes without bipolar history

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 F31.10 an HCC code?

Yes. F31.10 (Bipolar disorder, current episode manic without psychotic features, unspecified) maps to Bipolar Disorders without Psychosis under the CMS-HCC V28 risk adjustment model (and Major Depressive, Bipolar, and Paranoid Disorders under V24), with a community non-dual aged RAF of 0.351. It is billable for payment year 2026.

Coder answer: F31.10 is billable and maps to V28 HCC 154, Bipolar Disorders without Psychosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: F31.10
Description: Bipolar disorder, current episode manic without psychotic features, unspecified
HCC (V28): HCC 154 — Bipolar Disorders without Psychosis
RAF: 0.351
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 154, Bipolar Disorders without Psychosis

0.351

V24HCC 59, Major Depressive, Bipolar, and Paranoid Disorders

0.309

ESRDHCC 59, Major Depressive, Bipolar, and Paranoid Disorders

0.066

RxHCCHCC 131, Bipolar Disorders

0.240

Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F31.10 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F31.10

For F31.10 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F31.10 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F31.10 is the ICD-10-CM diagnosis code for bipolar disorder, current episode manic without psychotic features, unspecified. Bipolar disorder with a current manic episode that is not severe enough to include psychotic features, but the specific severity level (mild, moderate, or severe) is not documented. F31.10 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering mood [affective] disorders (f30-f39).

Under the CMS-HCC V28 risk adjustment model, F31.10 maps to Bipolar Disorders without Psychosis (HCC 154) with a community, non-dual, aged base RAF weight of 0.351. Under the older CMS-HCC V24 model, F31.10 maps to Major Depressive, Bipolar, and Paranoid Disorders (HCC 59) with a community, non-dual, aged base RAF weight of 0.309. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This unspecified code should be used only when severity cannot be determined from documentation. Because F31.10 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for F31.10 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This unspecified code should be used only when severity cannot be determined from documentation
•Review clinical notes for descriptions of functional impairment, sleep disruption, and behavioral changes to determine appropriate severity level

Clinical Significance

Bipolar disorder with current manic episode without psychotic features where severity is unspecified indicates an active manic state requiring close monitoring and typically medication adjustment. Full manic episodes carry substantial risks including impaired judgment, risky behavior, and potential need for hospitalization. This code captures significant psychiatric complexity for risk adjustment purposes.

Documentation Requirements

✓Confirmed diagnosis of bipolar disorder with documented history
✓Current manic episode symptoms described (elevated mood, grandiosity, decreased need for sleep, flight of ideas, increased activity)
✓Documentation that psychotic features are absent
✓Provider should ideally specify severity (mild, moderate, severe) — query if not documented
✓Current treatment regimen and any recent changes to medications

Commonly Confused Codes

•F31.0: Bipolar disorder, current episode hypomanic: Hypomania is a milder form that does not cause marked functional impairment
•F31.2: Bipolar disorder, current episode manic severe with psychotic features: Requires documented psychotic symptoms such as delusions or hallucinations
•F31.11: Same condition, mild severity: Use when provider specifically documents mild manic episode
•F30.10: Manic episode without psychotic features, unspecified: Use only for isolated manic episodes without bipolar history