What is ICD-10 code F31.30?

F31.30 is the ICD-10-CM diagnosis code for Bipolar disorder, current episode depressed, mild or moderate severity, unspecified. Bipolar disorder with a current depressive episode of mild or moderate severity, but the specific severity level is not documented or specified. F31.30 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F31.30 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. F31.30 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. F31.30 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.

What is the V28 vs V24 difference for F31.30?

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 F31.30, V28 maps to Bipolar Disorders at RAF 0.265 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 should coders know when reporting F31.30?

This unspecified code should only be used when the documentation does not clearly indicate mild versus moderate severity Query the provider to determine whether the depressive episode is mild or moderate based on symptom severity and functional impairment Because F31.30 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.

F31.30: Bipolar disorder, current episode depressed, mild or moderate severity, unspecified —

ICD-10-CM Code View

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

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

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

F31.30

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

Bipolar disorder, current episode depressed, mild or moderate severity, unspecified

Bipolar disorder with a current depressive episode of mild or moderate severity, but the specific severity level is not documented or specified.

Buddy Insight

Bipolar disorder with current depressed episode of mild or moderate severity that is unspecified indicates the patient is currently in the depressive phase of their bipolar illness.

CMS-HCC V28

Mapped

HCC 154

Bipolar Disorders

RAF 0.265

CMS-HCC V24

Mapped

HCC 59

Major Depressive, Bipolar, an...

RAF 0.309

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 59

Major Depressive, Bipolar, an...

RAF 0.0

RXHCC

Mapped

HCC 131

Bipolar Disorders

RAF 0.0

Code Trumping

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Code Book Path

Official

F31Bipolar disorder

F31.3Bipolar disorder, current episode depressed, mild or moderate severity

F31.30Bipolar disorder, current episode depressed, mild or moderate severity, unspecified

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F31.30 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F31.30 in this effective period.

Related Child Codes

Official

F31.31Bipolar disorder, current episode depressed, mild

F31.32Bipolar disorder, current episode depressed, moderate

Includes

Official

ICD-10-CM does not list Includes notes for F31.30 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F31.30 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F31.30 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F31.30 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F31.30 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Confirmed bipolar disorder diagnosis with documented history of manic or hypomanic episodes

Current depressive symptoms documented (depressed mood, anhedonia, sleep changes, appetite changes, fatigue)

Provider should specify mild versus moderate severity — query if not documented

Absence of psychotic features documented

MEAT Support

HCC Buddy guidance

Confirmed bipolar disorder diagnosis with documented history of manic or hypomanic episodes

Current depressive symptoms documented (depressed mood, anhedonia, sleep changes, appetite changes, fatigue)

Provider should specify mild versus moderate severity — query if not documented

Absence of psychotic features documented

Audit Caution

HCC Buddy guidance

Coding bipolar depression as unipolar major depressive disorder (F32/F33) when there is a bipolar diagnosis in the chart

Using the unspecified severity code when the provider has documented mild or moderate

Missing the bipolar history and coding as simple major depression, which changes the HCC mapping

Not recognizing that treatment with mood stabilizers or atypical antipsychotics suggests a bipolar diagnosis

Common Mistakes

HCC Buddy guidance

F32.9 — Major depressive disorder, single episode, unspecified: Use only when there is no history of manic or hypomanic episodes

F31.31 — Bipolar disorder, current episode depressed, mild: Use when mild severity is explicitly documented

F31.32 — Bipolar disorder, current episode depressed, moderate: Use when moderate severity is explicitly documented

F31.4 — Bipolar disorder, current episode depressed, severe without psychotic features: More severe presentation

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is F31.30 an HCC code?

Yes. F31.30 maps to Bipolar Disorders under the CMS-HCC V28 risk adjustment model (and Major Depressive, Bipolar, and Paranoid Disorders under V24).

HCC Category Mapping

V28HCC 154, Bipolar Disorders

0.265

V24HCC 59, Major Depressive, Bipolar, and Paranoid Disorders

0.309

ESRDHCC 59, Major Depressive, Bipolar, and Paranoid Disorders

0.000

RxHCCHCC 131, Bipolar Disorders

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. 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 F31.30 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F31.30

For F31.30to 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 F31.30 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F31.30 is the ICD-10-CM diagnosis code for bipolar disorder, current episode depressed, mild or moderate severity, unspecified. Bipolar disorder with a current depressive episode of mild or moderate severity, but the specific severity level is not documented or specified. F31.30 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, F31.30 maps to Bipolar Disorders (HCC 154) with a community, non-dual, aged base RAF weight of 0.265. Under the older CMS-HCC V24 model, F31.30 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 only be used when the documentation does not clearly indicate mild versus moderate severity. Because F31.30 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 F31.30 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This unspecified code should only be used when the documentation does not clearly indicate mild versus moderate severity
•Query the provider to determine whether the depressive episode is mild or moderate based on symptom severity and functional impairment

Clinical Significance

Bipolar disorder with current depressed episode of mild or moderate severity that is unspecified indicates the patient is currently in the depressive phase of their bipolar illness. Bipolar depression differs from unipolar depression in treatment approach, as standard antidepressants alone may trigger manic episodes. Accurate coding ensures appropriate treatment planning and risk stratification.

Documentation Requirements

✓Confirmed bipolar disorder diagnosis with documented history of manic or hypomanic episodes
✓Current depressive symptoms documented (depressed mood, anhedonia, sleep changes, appetite changes, fatigue)
✓Provider should specify mild versus moderate severity — query if not documented
✓Absence of psychotic features documented
✓Current treatment plan addressing bipolar depression specifically (mood stabilizers, atypical antipsychotics)

Commonly Confused Codes

•F32.9: Major depressive disorder, single episode, unspecified: Use only when there is no history of manic or hypomanic episodes
•F31.31: Bipolar disorder, current episode depressed, mild: Use when mild severity is explicitly documented
•F31.32: Bipolar disorder, current episode depressed, moderate: Use when moderate severity is explicitly documented
•F31.4: Bipolar disorder, current episode depressed, severe without psychotic features: More severe presentation