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F31.70 ICD-10-CM Code: Bipolar disorder, currently in remission, most recent episode unspecified

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

F31.70

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

Bipolar disorder, currently in remission, most recent episode unspecified

Bipolar disorder that is currently in remission (symptoms are controlled or absent) but the type of the most recent episode is not specified.

Buddy the Bee presenting code insight

Buddy Insight

Bipolar disorder currently in remission with the most recent episode type unspecified indicates the patient has a confirmed bipolar diagnosis but is not currently experiencing active manic or depressive symptoms, and the nature of the most recent episode is not documented.

CMS-HCC V28

N/A

—

Not mapped

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
F31.7Bipolar disorder, currently in remission
F31.70Bipolar disorder, currently in remission, most recent episode unspecified

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F31.70 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F31.70 in this effective period.

Related Child Codes

Official
F31.71Bipolar disorder, in partial remission, most recent episode hypomanic
F31.72Bipolar disorder, in full remission, most recent episode hypomanic
F31.73Bipolar disorder, in partial remission, most recent episode manic
F31.74Bipolar disorder, in full remission, most recent episode manic
F31.75Bipolar disorder, in partial remission, most recent episode depressed

Includes

Official

ICD-10-CM does not list Includes notes for F31.70 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F31.70 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F31.70 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F31.70 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F31.70 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Confirmed bipolar disorder diagnosis with documented episode history
Current remission status explicitly documented by the provider
Statement that the patient is not currently experiencing manic, hypomanic, or depressive symptoms
Current maintenance medication regimen documented

MEAT Support

HCC Buddy guidance
Confirmed bipolar disorder diagnosis with documented episode history
Current remission status explicitly documented by the provider
Statement that the patient is not currently experiencing manic, hypomanic, or depressive symptoms
Current maintenance medication regimen documented

Audit Caution

HCC Buddy guidance
Failing to query the provider about the most recent episode type, which would allow a more specific remission code
Using this code when the patient is having active symptoms — remission means absence of significant symptoms
Confusing remission with resolution — bipolar disorder is a chronic condition and should be coded at every visit where it is managed
Not coding bipolar disorder during remission when the provider is managing it with medications

Common Mistakes

HCC Buddy guidance
F31.9 — Bipolar disorder, unspecified: Does not specify remission status
F31.71 — Bipolar disorder, partial remission, most recent hypomanic: More specific about episode type and remission status
Z86.59 — Personal history of mental and behavioral disorders: Use only when the condition is resolved, not in ongoing remission
F31.89 — Other bipolar disorder: Use for atypical presentations, not remission

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 F31.70 an HCC code?

Yes. F31.70 maps to Major Depressive, Bipolar, and Paranoid Disorders under the V24 model but is not retained in V28.

Code
F31.70
Description
Bipolar disorder, currently in remission, most recent episode unspecified
HCC (V28)
No CMS-HCC V28 mapping
RAF
—
Billable
Yes
Payment year
2026

HCC Category Mapping

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 F31.70 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F31.70

For F31.70 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 F31.70 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F31.70 is the ICD-10-CM diagnosis code for bipolar disorder, currently in remission, most recent episode unspecified. Bipolar disorder that is currently in remission (symptoms are controlled or absent) but the type of the most recent episode is not specified. F31.70 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 older CMS-HCC V24 model, F31.70 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 only when remission status is documented but the most recent episode type cannot be determined. Because F31.70 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 F31.70 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Use only when remission status is documented but the most recent episode type cannot be determined
  • •If the most recent episode type is known, use F31.71-F31.76 for more specific coding

Clinical Significance

Bipolar disorder currently in remission with the most recent episode type unspecified indicates the patient has a confirmed bipolar diagnosis but is not currently experiencing active manic or depressive symptoms, and the nature of the most recent episode is not documented. While in remission, the diagnosis remains clinically relevant for medication management and relapse prevention. This code captures the ongoing nature of bipolar disorder even during stable periods.

Documentation Requirements

  • ✓Confirmed bipolar disorder diagnosis with documented episode history
  • ✓Current remission status explicitly documented by the provider
  • ✓Statement that the patient is not currently experiencing manic, hypomanic, or depressive symptoms
  • ✓Current maintenance medication regimen documented
  • ✓Follow-up plan for monitoring relapse

Commonly Confused Codes

  • •F31.9: Bipolar disorder, unspecified: Does not specify remission status
  • •F31.71: Bipolar disorder, partial remission, most recent hypomanic: More specific about episode type and remission status
  • •Z86.59: Personal history of mental and behavioral disorders: Use only when the condition is resolved, not in ongoing remission
  • •F31.89: Other bipolar disorder: Use for atypical presentations, not remission

Child Codes

F31.70Bipolar disorder, currently in remission, most recent episode unspecified
F31.71Bipolar disorder, in partial remission, most recent episode hypomanic
HCC 154
F31.72Bipolar disorder, in full remission, most recent episode hypomanic
F31.73Bipolar disorder, in partial remission, most recent episode manic
HCC 154
F31.74Bipolar disorder, in full remission, most recent episode manic
F31.75Bipolar disorder, in partial remission, most recent episode depressed
HCC 154
F31.76Bipolar disorder, in full remission, most recent episode depressed
F31.77Bipolar disorder, in partial remission, most recent episode mixed
HCC 154
F31.78Bipolar disorder, in full remission, most recent episode mixed

Code Hierarchy

└F31Bipolar disorder└F31.7Bipolar disorder, currently in remission└F31.70Bipolar disorder, currently in remission, most recent episode unspecified
└F31.70Bipolar disorder, currently in remission, most recent episode unspecified

Because F31.70 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.

Work F31.70 in HCC Buddy

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