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F31.89 ICD-10-CM Code: Other bipolar disorder

F31.89 maps to CMS-HCC V28 154 (RAF 0.351). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC coding tools

ICD-10-CM Code View

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

F31.89

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

Other bipolar disorder

Bipolar disorder that does not fit neatly into the standard Bipolar I or Bipolar II categories, such as rapid cycling or other atypical presentations.

Buddy the Bee presenting code insight

Buddy Insight

Other bipolar disorder captures bipolar spectrum presentations that do not fit neatly into standard bipolar I, bipolar II, or cyclothymic categories.

CMS-HCC V28

HCC 154

RAF 0.351

CMS-HCC V24

HCC 59

RAF 0.309

ACA/HHS

HCC 88

Varies by metal level

ESRD/PACE

HCC 59

RAF 0.066

RXHCC

HCC 131

RAF 0.240

Code Book Path

Official
F31Bipolar disorder
F31.8Other bipolar disorders
F31.89Other bipolar disorder

Inclusion Terms

Official
  • Recurrent manic episodes NOS

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F31.89 in this effective period.

Related Child Codes

Official
F31.81Bipolar II disorder

Includes

Official

ICD-10-CM does not list Includes notes for F31.89 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F31.89 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F31.89 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F31.89 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F31.89 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Provider documentation of a bipolar spectrum condition that does not meet criteria for bipolar I, II, or cyclothymia
Description of the specific atypical features or presentation
History of mood episodes supporting a bipolar spectrum diagnosis
Current treatment plan appropriate for bipolar spectrum conditions

MEAT Support

HCC Buddy guidance
Provider documentation of a bipolar spectrum condition that does not meet criteria for bipolar I, II, or cyclothymia
Description of the specific atypical features or presentation
History of mood episodes supporting a bipolar spectrum diagnosis
Current treatment plan appropriate for bipolar spectrum conditions

Audit Caution

HCC Buddy guidance
Using F31.89 as a catch-all when more specific bipolar codes are available
Confusing 'other' bipolar disorder with 'unspecified' bipolar disorder — they have different clinical meanings
Not documenting the specific features that make the presentation atypical
Using this code for bipolar disorder not yet confirmed, rather than a confirmed atypical presentation

Common Mistakes

HCC Buddy guidance
F31.9 — Bipolar disorder, unspecified: Use when no further specification is available at all; F31.89 implies the provider has identified specific features that are atypical
F31.81 — Bipolar II disorder: Specific well-defined bipolar subtype
F34.0 — Cyclothymic disorder: Chronic subsyndromal mood cycling
F39 — Unspecified mood disorder: Even less specific, should not be used when bipolar spectrum is identified

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 F31.89 an HCC code?

Yes. F31.89 (Other bipolar disorder) 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: F31.89 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
F31.89
Description
Other bipolar disorder
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 F31.89 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F31.89

For F31.89 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 F31.89 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F31.89 is the ICD-10-CM diagnosis code for other bipolar disorder. Bipolar disorder that does not fit neatly into the standard Bipolar I or Bipolar II categories, such as rapid cycling or other atypical presentations. F31.89 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, F31.89 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, F31.89 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.

Use this code only when the bipolar presentation does not meet criteria for F31.0-F31.81. Because F31.89 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 F31.89 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 bipolar presentation does not meet criteria for F31.0-F31.81
  • •Document the specific features that make this bipolar disorder atypical or unusual

Clinical Significance

Other bipolar disorder captures bipolar spectrum presentations that do not fit neatly into standard bipolar I, bipolar II, or cyclothymic categories. This may include bipolar disorder not otherwise specified, short-duration hypomanic episodes, or other atypical presentations that the provider recognizes as belonging to the bipolar spectrum. Accurate coding ensures these patients receive appropriate psychiatric care management.

Documentation Requirements

  • ✓Provider documentation of a bipolar spectrum condition that does not meet criteria for bipolar I, II, or cyclothymia
  • ✓Description of the specific atypical features or presentation
  • ✓History of mood episodes supporting a bipolar spectrum diagnosis
  • ✓Current treatment plan appropriate for bipolar spectrum conditions
  • ✓Rationale for why the standard bipolar categories do not apply

Commonly Confused Codes

  • •F31.9: Bipolar disorder, unspecified: Use when no further specification is available at all; F31.89 implies the provider has identified specific features that are atypical
  • •F31.81: Bipolar II disorder: Specific well-defined bipolar subtype
  • •F34.0: Cyclothymic disorder: Chronic subsyndromal mood cycling
  • •F39: Unspecified mood disorder: Even less specific, should not be used when bipolar spectrum is identified

Child Codes

F31.81Bipolar II disorder
HCC 154
F31.89Other bipolar disorder
HCC 154

Code Hierarchy

└F31Bipolar disorder└F31.8Other bipolar disorders└F31.89Other bipolar disorder
└F31.89Other bipolar disorder

Because F31.89 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.

F31.89 maps to CMS-HCC V28 category 154, Bipolar Disorders without Psychosis. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. Because F31.89 carries a payment HCC, you can see what it adds to a RAF score and check the documentation the chart needs before it is submitted.

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