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FY2027 ICD-10-CM reference

Q26.1: Persistent left superior vena cava

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Persistent left superior vena cava. 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.

Oct to Dec 2026, PY2027

CMS-HCC V28

No CMS category

No CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings CSV (all models) (PY2027).

CMS-HCC V24

Not used by CMS

CMS published no community V24 for PY2027 (CMS CY2027 Rate Announcement p3 l6-8: the 2024 CMS-HCC model only; the 2027 Initial mappings carry no community V24 column)

ESRD

No CMS category

No ESRD category in the CMS 2027 Initial ICD-10-CM Mappings CSV (all models) (PY2027).

RxHCC

Mapped

HCC 191Ventricular Septal Defect and Major Congenita...Coefficient 0.138 (MA-PD CE non-low aged, PY2027)

PACE (CMS-HCC V22 component)

No CMS category

No PACE (CMS-HCC V22 component) category in the CMS 2027 Initial ICD-10-CM Mappings CSV (all models) (PY2027).

PACE ESRD (ESRD V21 component)

No CMS category

No PACE ESRD (ESRD V21 component) category in the CMS 2027 Initial ICD-10-CM Mappings CSV (all models) (PY2027).

PACE RxHCC (2018/2019 component)

Mapped

HCC 191Ventricular Septal Defect and Major Congenita...

Jan to Sep 2027, PY2028

CMS-HCC V28

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

CMS-HCC V24

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

ESRD

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

RxHCC

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

PACE (CMS-HCC V22 component)

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

PACE ESRD (ESRD V21 component)

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

PACE RxHCC component

Not published by CMS

Not published by CMS for PY2028. (No CY2028 Advance Notice or Rate Announcement on cms.gov as of 2026-11-02)

Oct to Dec 2026, BY2026

HHS-HCC

Pending

CMS has not published FY2027 code validity for BY2026 HHS-HCC (Table 3 update pending). Mapping pending. (CMS CY2026 DIY instructions p8 l39-45: FY2027 code information for October 1 to December 31, 2026 service dates is not in Table 3 yet; valid_ICD10_2027 is blank on all 12,667 rows)

Jan to Sep 2027, BY2027

HHS-HCC

Not published by CMS

Not published by CMS for BY2027. (CMS-9883-F (2026-05-15) finalizes BY2027 factors (NBPP 2027 p53 l17-21); CMS has posted no BY2027 DIY Table 3 as of 2026-11-02)

FY2027 Tabular instructions

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

Instructional note

Codes from this chapter are not for use on maternal records

Source: Q00-QA1 (chapter, inherited).

Excludes2

inborn errors of metabolism (E70-E88)

Source: Q00-QA1 (chapter, inherited).

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 Q26.1 mean in FY2027?

The official ICD-10-CM descriptor is Persistent left superior vena cava. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is Q26.1 billable in FY2027?

The FY2027 order file marks Q26.1 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does Q26.1 map to an HCC?

Oct to Dec 2026, PY2027: CMS-HCC V28: No CMS category; CMS-HCC V24: Not used by CMS; ESRD: No CMS category; RxHCC HCC 191 (Ventricular Septal Defect and Major Congenital Heart Disorders). Jan to Sep 2027, PY2028: CMS-HCC V28: Not published by CMS; CMS-HCC V24: Not published by CMS; ESRD: Not published by CMS; RxHCC: Not published by CMS. Oct to Dec 2026, BY2026: HHS-HCC: Pending. Jan to Sep 2027, BY2027: HHS-HCC: Not published by CMS. Base coefficients are reference values, not a member total.

Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.

Review the FY2026 April edition