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I50.20 ICD-10-CM Code: Unspecified systolic (congestive) heart failure

I50.20 maps to CMS-HCC V28 226 (RAF 0.360). Documentation must support MEAT. MEAT criteria · RAF calculator · HCC Buddy coding tools

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FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Other forms of heart disease (I30-I5A)

I50.20

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

Unspecified systolic (congestive) heart failure

The heart's lower left chamber cannot pump blood forward effectively, causing fluid to back up into the lungs and body, resulting in congestive heart failure symptoms.

Buddy the Bee presenting code insight

Buddy Insight

Unspecified systolic congestive heart failure (heart failure with reduced ejection fraction) indicates the left ventricle cannot contract effectively to pump blood forward.

CMS-HCC V28

HCC 226

RAF 0.360

CMS-HCC V24

HCC 85

RAF 0.331

ACA/HHS

HCC 130

Varies by metal level

ESRD/PACE

HCC 85

RAF 0.063

RXHCC

HCC 186

RAF 0.110

Code Book Path

Official
I50Heart failure
I50.2Systolic (congestive) heart failure
I50.20Unspecified systolic (congestive) heart failure

Inclusion Terms

Official
  • Heart failure with reduced ejection fraction [HFrEF]
  • Systolic left ventricular heart failure

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I50.20 in this effective period.

Related Child Codes

Official
I50.21Acute systolic (congestive) heart failure
I50.22Chronic systolic (congestive) heart failure
I50.23Acute on chronic systolic (congestive) heart failure

Includes

Official

ICD-10-CM does not list Includes notes for I50.20 in this effective period.

Excludes 1

Official
  • combined systolic (congestive) and diastolic (congestive) heart failure (I50.4-)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I50.20 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I50.20 in this effective period.

Code Also

Official
  • end stage heart failure, if applicable (I50.84)

Buddy Documentation Tip

HCC Buddy guidance
Provider documentation of systolic heart failure or heart failure with reduced ejection fraction
Ejection fraction value — typically less than 40% for systolic dysfunction
Acuity should be specified (acute, chronic, or acute on chronic) — this code is used only when unspecified
Current guideline-directed medical therapy medications

MEAT Support

HCC Buddy guidance
Provider documentation of systolic heart failure or heart failure with reduced ejection fraction
Ejection fraction value — typically less than 40% for systolic dysfunction
Acuity should be specified (acute, chronic, or acute on chronic) — this code is used only when unspecified
Current guideline-directed medical therapy medications

Audit Caution

HCC Buddy guidance
Using this unspecified code when acuity (acute, chronic, acute on chronic) is documented in the chart
Confusing systolic heart failure with diastolic heart failure — ejection fraction helps differentiate
Not querying the provider about acuity when documentation simply says 'systolic heart failure'
Failing to capture that heart failure with reduced ejection fraction equals systolic heart failure

Common Mistakes

HCC Buddy guidance
I50.21 — Acute systolic heart failure: use when documented as acute or new onset
I50.22 — Chronic systolic heart failure: use when documented as chronic or long-standing
I50.23 — Acute on chronic systolic heart failure: use when chronic disease has acute exacerbation
I50.30 — Unspecified diastolic heart failure: diastolic dysfunction involves impaired relaxation, not impaired contraction

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 I50.20 an HCC code?

Yes. I50.20 (Unspecified systolic (congestive) heart failure) maps to Heart Failure, Except End Stage and Acute under the CMS-HCC V28 risk adjustment model (and Congestive Heart Failure under V24), with a community non-dual aged RAF of 0.360. It is billable for payment year 2026.

Coder answer: I50.20 is billable and maps to V28 HCC 226, Heart Failure, Except End Stage and Acute. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
I50.20
Description
Unspecified systolic (congestive) heart failure
HCC (V28)
HCC 226 — Heart Failure, Except End Stage and Acute
RAF
0.360
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 226, Heart Failure, Except End Stage and Acute
0.360
V24HCC 85, Congestive Heart Failure
0.331
ESRDHCC 85, Congestive Heart Failure
0.063
RxHCCHCC 186, Heart Failure
0.110

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 I50.20 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for I50.20

For I50.20 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 I50.20 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I50.20 is the ICD-10-CM diagnosis code for unspecified systolic (congestive) heart failure. The heart's lower left chamber cannot pump blood forward effectively, causing fluid to back up into the lungs and body, resulting in congestive heart failure symptoms. I50.20 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering other forms of heart disease (i30-i5a).

Under the CMS-HCC V28 risk adjustment model, I50.20 maps to Heart Failure, Except End Stage and Acute (HCC 226) with a community, non-dual, aged base RAF weight of 0.360. Under the older CMS-HCC V24 model, I50.20 maps to Congestive Heart Failure (HCC 85) with a community, non-dual, aged base RAF weight of 0.331. 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.

Provider documentation must establish systolic CHF without further chronicity specification. If the chart supports acute (I50.21), chronic (I50.22), or acute on chronic (I50.23) HF, select that code instead of the unspecified I50.20. Because I50.20 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 I50.20 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Provider documentation must establish systolic CHF without further chronicity specification. If the chart supports acute (I50.21), chronic (I50.22), or acute on chronic (I50.23) HF, select that code instead of the unspecified I50.20.
  • •I50.20 is a commonly over-used unspecified option. An EF below 40% with a statement like 'chronic systolic heart failure, stable' supports I50.22 and should be preferred.
  • •V28 HCC 226 at RAF 0.36. All systolic subtypes share the HCC, the specificity upgrade is a documentation hygiene matter, not a RAF change.

Clinical Significance

Unspecified systolic congestive heart failure (heart failure with reduced ejection fraction) indicates the left ventricle cannot contract effectively to pump blood forward. This diagnosis carries significant implications for treatment selection, monitoring intensity, and prognosis. Acuity specification (acute, chronic, or acute on chronic) should always be pursued.

Documentation Requirements

  • ✓Provider documentation of systolic heart failure or heart failure with reduced ejection fraction
  • ✓Ejection fraction value — typically less than 40% for systolic dysfunction
  • ✓Acuity should be specified (acute, chronic, or acute on chronic) — this code is used only when unspecified
  • ✓Current guideline-directed medical therapy medications
  • ✓New York Heart Association functional class
  • ✓Volume status assessment and symptoms

Commonly Confused Codes

  • •I50.21: Acute systolic heart failure: use when documented as acute or new onset
  • •I50.22: Chronic systolic heart failure: use when documented as chronic or long-standing
  • •I50.23: Acute on chronic systolic heart failure: use when chronic disease has acute exacerbation
  • •I50.30: Unspecified diastolic heart failure: diastolic dysfunction involves impaired relaxation, not impaired contraction
  • •I50.1: Left ventricular failure, unspecified: does not specify systolic vs diastolic type

Child Codes

I50.20Unspecified systolic (congestive) heart failure
HCC 226
I50.21Acute systolic (congestive) heart failure
HCC 225
I50.22Chronic systolic (congestive) heart failure
HCC 226
I50.23Acute on chronic systolic (congestive) heart failure
HCC 224

Code Hierarchy

└I50Heart failure└I50.2Systolic (congestive) heart failure└I50.20Unspecified systolic (congestive) heart failure
└I50.20Unspecified systolic (congestive) heart failure

Because I50.20 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.

I50.20 maps to CMS-HCC V28 category 226, Heart Failure, Except End Stage and Acute. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. Because I50.20 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.

More on I50.20

Related condition guides

Referenced in blog posts

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Open I50.20 in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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