What is ICD-10 code I20.89?

I20.89 is the ICD-10-CM diagnosis code for Other forms of angina pectoris. Chest pain caused by reduced blood flow to the heart that doesn't fit into other specific angina categories, such as vasospastic angina or angina occurring after exertion. I20.89 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I20.89 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. I20.89 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. I20.89 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.

Which HCC does I20.89 map to under V28?

I20.89 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

What does I20.89 pay in RAF?

I20.89 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

What is the V28 vs V24 difference for I20.89?

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. I20.89 was a payment HCC under V24 (Angina Pectoris) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports I20.89?

Use this code when documentation describes angina variants not captured by I20.0 (unstable), I20.1 (vasospastic), or I20.8 other specified forms Ensure documentation supports the specific type of angina before assigning this code; query provider if angina type is unclear Because I20.89 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. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM I20.89: Other forms of angina

I20.89 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · HCC Buddy coding tools

ICD-10-CM Code View

HCC Buddy Code Card

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

Code lookupI20.89Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Ischemic heart diseases (I20-I25)

I20.89

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

Other forms of angina pectoris

Chest pain caused by reduced blood flow to the heart that doesn't fit into other specific angina categories, such as vasospastic angina or angina occurring after exertion.

Buddy Insight

Other forms of angina pectoris represent atypical angina variants that may indicate underlying coronary artery disease requiring risk stratification.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 88

Angina Pectoris

RAF 0.135

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Mapped

HCC 88

Angina Pectoris

RAF 0.043

RXHCC

Mapped

HCC 188

Coronary Artery Disease and A...

RAF 0.052

Code Book Path

Official

I20Angina pectoris

I20.8Other forms of angina pectoris

I20.89Other forms of angina pectoris

Inclusion Terms

Official

Angina equivalent
Angina of effort
Coronary slow flow syndrome
Stable angina
Stenocardia

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I20.89 in this effective period.

Related Child Codes

Official

I20.81Angina pectoris with coronary microvascular dysfunction

Includes

Official

ICD-10-CM does not list Includes notes for I20.89 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I20.89 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I20.89 in this effective period.

Use Additional

Official

code(s) for symptoms associated with angina equivalent

Code Also

Official

ICD-10-CM does not list Code Also instructions for I20.89 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Description of the specific angina variant (e.g., angina decubitus, nocturnal angina, slow coronary flow angina)

Clinical presentation including onset, duration, frequency, and provocative factors

Diagnostic workup results (electrocardiogram, stress testing, cardiac catheterization if performed)

Current treatment plan and medication management

MEAT Support

HCC Buddy guidance

Description of the specific angina variant (e.g., angina decubitus, nocturnal angina, slow coronary flow angina)

Clinical presentation including onset, duration, frequency, and provocative factors

Diagnostic workup results (electrocardiogram, stress testing, cardiac catheterization if performed)

Current treatment plan and medication management

Audit Caution

HCC Buddy guidance

Assigning this code when documentation actually supports unstable angina (I20.0), which has significant HCC implications

Using this code when spasm is documented — I20.1 is more specific

Failing to query the provider for the specific angina type, which may allow a more precise code

Confusing angina equivalents (dyspnea, fatigue) with true angina documentation

Common Mistakes

HCC Buddy guidance

I20.0 — Unstable angina: indicates worsening or new-onset angina at rest, a more acute and dangerous presentation

I20.1 — Angina pectoris with documented spasm (Prinzmetal/vasospastic): requires documented coronary artery spasm

I20.9 — Angina pectoris, unspecified: used only when the type of angina is not documented at all

I25.111 — Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm: combination code when coronary artery disease is also present

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 I20.89 an HCC code?

Yes. I20.89 maps to Angina Pectoris under the V24 model but is not retained in V28.

Code: I20.89
Description: Other forms of angina pectoris
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 88, Angina Pectoris

0.135

ESRDHCC 88, Angina Pectoris

0.043

RxHCCHCC 188, Coronary Artery Disease and Angina

0.052

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 I20.89 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for I20.89

For I20.89 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 I20.89 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

I20.89 is the ICD-10-CM diagnosis code for other forms of angina pectoris. Chest pain caused by reduced blood flow to the heart that doesn't fit into other specific angina categories, such as vasospastic angina or angina occurring after exertion. I20.89 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering ischemic heart diseases (i20-i25).

Under the older CMS-HCC V24 model, I20.89 maps to Angina Pectoris (HCC 88) with a community, non-dual, aged base RAF weight of 0.135. 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 when documentation describes angina variants not captured by I20.0 (unstable), I20.1 (vasospastic), or I20.8 other specified forms. Because I20.89 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 I20.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code when documentation describes angina variants not captured by I20.0 (unstable), I20.1 (vasospastic), or I20.8 other specified forms
•Ensure documentation supports the specific type of angina before assigning this code; query provider if angina type is unclear

Clinical Significance

Other forms of angina pectoris represent atypical angina variants that may indicate underlying coronary artery disease requiring risk stratification. Accurate capture ensures appropriate resource allocation for patients with ischemic symptoms that fall outside classic angina patterns. These patients often need further cardiac workup to rule out more severe ischemic heart disease.

Documentation Requirements

✓Description of the specific angina variant (e.g., angina decubitus, nocturnal angina, slow coronary flow angina)
✓Clinical presentation including onset, duration, frequency, and provocative factors
✓Diagnostic workup results (electrocardiogram, stress testing, cardiac catheterization if performed)
✓Current treatment plan and medication management
✓Exclusion of unstable angina (I20.0) and vasospastic angina (I20.1)

Commonly Confused Codes

•I20.0: Unstable angina: indicates worsening or new-onset angina at rest, a more acute and dangerous presentation
•I20.1: Angina pectoris with documented spasm (Prinzmetal/vasospastic): requires documented coronary artery spasm
•I20.9: Angina pectoris, unspecified: used only when the type of angina is not documented at all
•I25.111: Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm: combination code when coronary artery disease is also present
•R07.9: Chest pain, unspecified: should not be used when angina is the established diagnosis

Child Codes

I20.81Angina pectoris with coronary microvascular dysfunction

I20.89Other forms of angina pectoris

Code Hierarchy

└I20Angina pectoris └I20.8Other forms of angina pectoris └I20.89Other forms of angina pectoris

└I20.89Other forms of angina pectoris

HCC Buddy Code Card

I20.89

Is I20.89 an HCC code?

HCC Category Mapping

MEAT Criteria for I20.89

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

I20.89 code history

More on I20.89

Related condition guides

Work I20.89 in HCC Buddy

I20.89 ICD-10-CM Code: Other forms of angina pectoris

HCC Buddy Code Card

I20.89

Is I20.89 an HCC code?

HCC Category Mapping

MEAT Criteria for I20.89

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

I20.89 code history

More on I20.89

Related condition guides

Work I20.89 in HCC Buddy