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FY2027 ICD-10-CM reference

G63: Polyneuropathy in diseases classified elsewhere

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Polyneuropathy in diseases classified elsewhere. 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

No V28 HCC for 2026 dates of service (CMS 2027 Initial ICD-10-CM Mappings)

CMS-HCC V24

Not used for payment year 2027 Medicare Advantage payment

ESRD

  • HCC 75: Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy

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 158: Inflammatory and Toxic Neuropathy

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

  • HCC 115: Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy

RAF not applicable: HHS-HCC weights vary by metal level. Mapping: HHS-HCC 2026 benefit year.

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: G00-G99 (chapter, inherited).

Excludes2

certain infectious and parasitic diseases (A00-B99)

Source: G00-G99 (chapter, inherited).

Excludes2

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

Source: G00-G99 (chapter, inherited).

Excludes2

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

Source: G00-G99 (chapter, inherited).

Excludes2

endocrine, nutritional and metabolic diseases (E00-E88)

Source: G00-G99 (chapter, inherited).

Excludes2

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

Source: G00-G99 (chapter, inherited).

Excludes2

neoplasms (C00-D49)

Source: G00-G99 (chapter, inherited).

Excludes2

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

Source: G00-G99 (chapter, inherited).

Excludes1

neuralgia NOS (M79.2)

Source: G60-G65 (section, inherited).

Excludes1

neuritis NOS (M79.2)

Source: G60-G65 (section, inherited).

Excludes1

peripheral neuritis in pregnancy (O26.82-)

Source: G60-G65 (section, inherited).

Excludes1

radiculitis NOS (M54.10)

Source: G60-G65 (section, inherited).

Code first

underlying disease, such as:

Source: G63 (category, direct).

Code first

amyloidosis (E85.-)

Source: G63 (category, direct).

Code first

endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)

Source: G63 (category, direct).

Code first

metabolic diseases (E70-E88)

Source: G63 (category, direct).

Code first

neoplasm (C00-D49)

Source: G63 (category, direct).

Code first

nutritional deficiency (E40-E64)

Source: G63 (category, direct).

Excludes1

polyneuropathy (in):

Source: G63 (category, direct).

Excludes1

diabetes mellitus (E08-E13 with .42)

Source: G63 (category, direct).

Excludes1

diphtheria (A36.83)

Source: G63 (category, direct).

Excludes1

infectious mononucleosis complicated by polyneuropathy (B27.0-B27.9 with fifth character 1)

Source: G63 (category, direct).

Excludes1

Lyme disease (A69.22)

Source: G63 (category, direct).

Excludes1

mumps (B26.84)

Source: G63 (category, direct).

Excludes1

postherpetic (B02.23)

Source: G63 (category, direct).

Excludes1

rheumatoid arthritis (M05.5-)

Source: G63 (category, direct).

Excludes1

scleroderma (M34.83)

Source: G63 (category, direct).

Excludes1

systemic lupus erythematosus (M32.19)

Source: G63 (category, 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 G63 mean in FY2027?

The official ICD-10-CM descriptor is Polyneuropathy in diseases classified elsewhere. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is G63 billable in FY2027?

The FY2027 order file marks G63 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does G63 map to an HCC?

G63 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: ESRD HCC 75; RxHCC HCC 158. Coefficients for these models are pending verification for payment year 2027. HHS-HCC: HCC 115 under the HHS-HCC 2026 benefit year mapping (no RAF; HHS-HCC weights vary by metal level). CMS-HCC V24: not used for payment year 2027 Medicare Advantage payment (CMS CY 2027 Rate Announcement). The PACE mapping is still pending verification for FY2027.

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