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FY2027 ICD-10-CM reference

I28.1: Aneurysm of pulmonary artery

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Aneurysm of pulmonary artery. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Billable code. Verified against the official FY2027 order file.

CMS-HCC V28

  • HCC 226: Heart Failure, Except End Stage and Acute · RAF 0.360, Community Non-Dual Aged (CNA)

Payment year 2027, 2026 dates of service. HCC from the CMS 2027 Initial ICD-10-CM Mappings; RAF from the CMS-HCC V28 relative factors. For 2027 dates of service, CMS has not yet published the payment year 2028 mappings.

CMS-HCC V24

Not used for payment year 2027 Medicare Advantage payment

ESRD

  • HCC 85: Congestive Heart Failure

Coefficient pending: payment year 2027 coefficients for this model are not yet verified, so no RAF is shown. Mapping: PY2026 CMS mapping; CMS 2027 initial file unchanged.

PACE

Source verification pending

RxHCC

  • HCC 184: Pulmonary Hypertension, Except Arterial, and Other Pulmonary Heart Disease

Coefficient pending: payment year 2027 coefficients for this model are not yet verified, so no RAF is shown. Mapping: PY2026 CMS mapping; CMS 2027 initial file unchanged.

HHS-HCC

Source verification pending

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Excludes2

certain conditions originating in the perinatal period (P04-P96)

Source: I00-I99 (chapter, inherited).

Excludes2

certain infectious and parasitic diseases (A00-B99)

Source: I00-I99 (chapter, inherited).

Excludes2

complications of pregnancy, childbirth and the puerperium (O00-O9A)

Source: I00-I99 (chapter, inherited).

Excludes2

congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)

Source: I00-I99 (chapter, inherited).

Excludes2

endocrine, nutritional and metabolic diseases (E00-E88)

Source: I00-I99 (chapter, inherited).

Excludes2

injury, poisoning and certain other consequences of external causes (S00-T88)

Source: I00-I99 (chapter, inherited).

Excludes2

neoplasms (C00-D49)

Source: I00-I99 (chapter, inherited).

Excludes2

symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: I00-I99 (chapter, inherited).

Excludes2

systemic connective tissue disorders (M30-M36)

Source: I00-I99 (chapter, inherited).

Excludes2

transient cerebral ischemic attacks and related syndromes (G45.-)

Source: I00-I99 (chapter, inherited).

Excludes1

congenital aneurysm (Q25.79)

Source: I28.1 (self, direct).

Excludes1

congenital arteriovenous aneurysm (Q25.72)

Source: I28.1 (self, direct).

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does I28.1 mean in FY2027?

The official ICD-10-CM descriptor is Aneurysm of pulmonary artery. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is I28.1 billable in FY2027?

The FY2027 order file marks I28.1 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does I28.1 map to an HCC?

In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), I28.1 maps to CMS-HCC V28 HCC 226 (Heart Failure, Except End Stage and Acute). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: ESRD HCC 85; RxHCC HCC 184. Coefficients for these models are pending verification for payment year 2027. CMS-HCC V24, PACE and HHS-HCC mappings are still pending verification for FY2027.

Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.

Review the FY2026 April edition