F31.77 ICD-10-CM Code: Bipolar disorder, in partial remission, most recent episode mixed
F31.77 maps to CMS-HCC V28 154 (RAF 0.351). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Mood [affective] disorders (F30-F39)
F31.77
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceBipolar disorder, in partial remission, most recent episode mixed
Bipolar disorder where the patient still has some residual symptoms, and their most recent mood episode involved both manic and depressive features occurring together (mixed episode).
Buddy Insight
Bipolar disorder in partial remission with the most recent episode being mixed indicates the patient is recovering from a simultaneously manic and depressive episode but still has residual symptoms from both poles.
CMS-HCC V28
MappedHCC 154
RAF 0.351
CMS-HCC V24
MappedHCC 59
RAF 0.309
ACA/HHS
MappedHCC 88
Varies by metal level
ESRD/PACE
MappedHCC 59
RAF 0.066
RXHCC
MappedHCC 131
RAF 0.240
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for F31.77 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for F31.77 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for F31.77 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for F31.77 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for F31.77 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for F31.77 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for F31.77 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 F31.77 an HCC code?
Yes. F31.77 (Bipolar disorder, in partial remission, most recent episode mixed) 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: F31.77 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
- F31.77
- Description
- Bipolar disorder, in partial remission, most recent episode mixed
- HCC (V28)
- HCC 154 — Bipolar Disorders without Psychosis
- RAF
- 0.351
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
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 F31.77 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for F31.77
For F31.77 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 F31.77 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
Get the V28 RAF + MEAT cheat sheet
One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
F31.77 is the ICD-10-CM diagnosis code for bipolar disorder, in partial remission, most recent episode mixed. Bipolar disorder where the patient still has some residual symptoms, and their most recent mood episode involved both manic and depressive features occurring together (mixed episode). F31.77 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, F31.77 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, F31.77 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.
Partial remission from mixed episodes requires documentation of which symptoms persist. Because F31.77 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 F31.77 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Partial remission from mixed episodes requires documentation of which symptoms persist
- •Mixed episodes are particularly important to document as they may indicate higher suicide risk
Clinical Significance
Bipolar disorder in partial remission with the most recent episode being mixed indicates the patient is recovering from a simultaneously manic and depressive episode but still has residual symptoms from both poles. Mixed episodes are particularly difficult to treat, and partial remission suggests ongoing mood instability requiring close follow-up and careful medication titration.
Documentation Requirements
- ✓Confirmed bipolar disorder diagnosis
- ✓Most recent episode documented as mixed (concurrent manic and depressive features)
- ✓Partial remission status with residual symptoms described
- ✓Specification of which residual symptoms persist (manic, depressive, or both)
- ✓Current medication management plan
- ✓Safety monitoring plan
Commonly Confused Codes
- •F31.78: Bipolar disorder, full remission, most recent mixed: Complete symptom resolution
- •F31.60-F31.63: Bipolar disorder, current mixed episode: Active mixed episode, not in remission
- •F31.73: Bipolar disorder, partial remission, most recent manic: Last episode was pure mania
- •F31.75: Bipolar disorder, partial remission, most recent depressed: Last episode was pure depression