G62.9: Polyneuropathy, unspecified

The ICD-10-CM code for peripheral neuropathy when the diagnosis is established but the underlying cause has not been identified or documented.

Billable

FY2027

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At a glance

Code Family

G62: Other and unspecified polyneuropathies.

HCC Mapping (v28)

None. G62.9 carries no HCC weight in CMS-HCC v28, and it carried none in CMS-HCC v24.

DRG Grouping

MS-DRG 073 or 074, Cranial and Peripheral Nerve Disorders with MCC or without MCC, in MDC 01 under the FY2027 MS-DRG v44 grouper.

Condition

Peripheral neuropathy

Family Specificity

Five subcategories at G62 split on the documented cause of the polyneuropathy, with G62.9 reserved for neuropathy whose etiology remains undetermined after evaluation.

Billable

Yes. G62.9 is a valid code for HIPAA-covered transactions.

Which G62 code do I assign?

The G62 family splits on the documented cause of the polyneuropathy rather than on its severity or its distribution. Assign G62.9 only when the record shows that the etiology remains undetermined after evaluation.

When documentation says…

Code

Peripheral neuropathy in a patient with type 2 diabetes

E11.40

Type 2 diabetes mellitus with diabetic neuropathy, unspecified. Diabetic neuropathy is captured by the diabetes combination code. G62.9 is not assigned when diabetes is the documented etiology.

Neuropathy attributed to a medication

G62.0

Drug-induced polyneuropathy. A Use additional note at G62.0 calls for the adverse effect code (T36–T50 with fifth or sixth character 5) to identify the drug. The record must name the drug.

Alcoholic polyneuropathy

G62.1

Alcoholic polyneuropathy. The record must document alcohol as the etiology of the neuropathy.

Polyneuropathy due to another toxic agent

G62.2

Polyneuropathy due to other toxic agents. A Code first note at G62.2 sequences the toxic agent (T51–T65) first, and the clinical record must name it.

Polyneuropathy following a prolonged critical illness

G62.81

Critical illness polyneuropathy. The note must tie the neuropathy to critical illness, sepsis or multi-organ failure.

Polyneuropathy of a stated cause that no other G62 subcategory covers

G62.89

Other specified polyneuropathies. The note must state a known etiology.

Peripheral neuropathy, cause undetermined after workup

G62.9

Polyneuropathy, unspecified. The note must show that the diagnosis is established and that no etiology has been identified or documented.

Tabular notes

CODE FIRST

G62.9 carries no Code first instruction, and category G62 carries none. G62.2 carries a Code first note for the toxic agent (T51–T65). G62.0 carries a Use additional note for the adverse effect code. Polyneuropathy in a disease classified elsewhere is coded to G63, which carries a Code first note for the underlying disease. The note lists amyloidosis (E85.-), endocrine disease except diabetes (E00–E07, E15–E16, E20–E34), metabolic diseases (E70–E88), neoplasm (C00–D49) and nutritional deficiency (E40–E64).

EXCLUDES1

G62.9 and category G62 carry no Excludes note. Block G60–G65 carries an Excludes1 note for neuralgia NOS (M79.2), neuritis NOS (M79.2), peripheral neuritis in pregnancy (O26.82-) and radiculitis NOS (M54.10). Once the etiology of the unspecified neuropathy becomes known, the specific code replaces G62.9.

FY2027: EFFECTIVE 1 OCTOBER 2026

G62.9 is unchanged in the FY2027 update. The FY2027 codes and tabular addenda change nothing in category G62.

Operational & financial impact

Why specificity matters beyond the chart: risk adjustment, DRG assignment and denial exposure all follow from which code is selected.

CMS-HCC v28 (PY2024+)

G62.9 does not map to any HCC category in CMS-HCC v28.

G62.9 also carried no HCC mapping in CMS-HCC v24. The v24 to v28 transition did not change its risk adjustment status.

The code contributes no RAF value on its own.

WHERE SPECIFICITY IS LOST

Risk adjustment capture for neuropathy runs through the underlying etiology code rather than through G62.9.

Diabetic neuropathy is captured through the E11.40–E11.49 combination codes for type 2 diabetes mellitus. The parallel type 1 codes are E10.40–E10.49.

Documenting the specific type and etiology of the neuropathy is what enables capture through the appropriate disease code.

MS-DRG v44 (FY2027)

G62.9 as a principal inpatient diagnosis groups to MS-DRG 073 or 074 within MDC 01, Diseases and Disorders of the Nervous System, under the FY2027 MS-DRG v44 grouper. MS-DRG 073 is Cranial and Peripheral Nerve Disorders with MCC, and MS-DRG 074 is Cranial and Peripheral Nerve Disorders without MCC.

A reported secondary MCC can move the case from MS-DRG 074 to MS-DRG 073. The pair has no with-CC tier.

Medicare and commercial payers

G62.9 is valid for Medicare claims.

Electrodiagnostic testing, including nerve conduction studies and electromyography, is covered when medically necessary for the evaluation of neuropathy. Local Coverage Determinations for those services reference neuropathy codes including G62.9.

Documentation checklist to support G62.9

Chart elements that support code selection and reduce specificity-driven denials.

Peripheral neuropathy, polyneuropathy or neuropathy stated as a clinical diagnosis.

Clinical findings that support the diagnosis, such as numbness, tingling or weakness.

Electrodiagnostic testing results where performed, such as nerve conduction studies or electromyography.

A statement that the etiology is undetermined, or the absence of any identified cause in the record.

Where an etiology is documented, the underlying condition recorded in enough detail to be coded.

Diabetes status, because documented diabetic neuropathy is coded to the E11.4- or E10.4- combination codes rather than to G62.9.

Medication history, because a documented drug cause directs the encounter to G62.0.

Alcohol use history, because a documented alcohol etiology directs the encounter to G62.1.

For inpatient discharges, the established etiology where it was identified during the admission.

FAQ

Is G62.9 a billable code?

Yes. G62.9 is a valid code for HIPAA-covered transactions. It has no child codes and requires no further characters.

A patient with type 2 diabetes has peripheral neuropathy. Should I use E11.40 or G62.9?

Use E11.40, type 2 diabetes mellitus with diabetic neuropathy, unspecified, or the appropriate E11.4- code. The ICD-10-CM combination codes for diabetic neuropathy are the correct codes. G62.9 is not used when diabetes is the documented or assumed etiology.

Does G62.9 map to an HCC under CMS-HCC v28?

No. G62.9 carries no HCC mapping in CMS-HCC v28, and it carried none in CMS-HCC v24. Risk adjustment capture for neuropathy runs through the code for the underlying disease.

Does a Code First instruction apply to G62.9?

No. G62.9 carries no Code first instruction, and category G62 carries none. G62.2 carries a Code first note for the toxic agent (T51–T65), and G62.0 carries a Use additional note for the adverse effect code. Polyneuropathy in a disease classified elsewhere is coded to G63, which carries a Code first note for the underlying disease.

What must the note show to support G62.9?

The note must state peripheral neuropathy, polyneuropathy or neuropathy as a clinical diagnosis, supported by findings such as numbness, tingling or weakness, or by electrodiagnostic testing. It must also show that no etiology has been identified, or that the cause remains undetermined.

How does G62.9 differ between outpatient and inpatient coding?

In the outpatient setting, G62.9 is appropriate while the etiology workup is still ongoing. The code is updated to the specific etiology code once the workup resolves. On the inpatient side, G62.9 at discharge implies that the etiology remained undetermined during the admission.

Did anything change for G62.9 in FY2027?

No. G62.9 is unchanged in the FY2027 update, effective 1 October 2026. The FY2027 codes and tabular addenda change nothing in category G62.

Which G62.9 coding errors should I avoid?

The first error is assigning G62.9 when diabetic neuropathy is documented, where the E11.4- or E10.4- combination code applies. The second is assigning G62.9 when drug-induced neuropathy is documented, where G62.0 applies with the adverse effect code added under its Use additional note. The third is failing to replace G62.9 once the etiology is later established.

Related codes

Codes in the same family as G62.9. Only codes with a published page render as links.

Sibling codes in the G62 family

G62.0: Drug-induced polyneuropathy.
G62.1: Alcoholic polyneuropathy.
G62.2: Polyneuropathy due to other toxic agents.
G62.81: Critical illness polyneuropathy.
G62.82: Radiation-induced polyneuropathy.
G62.89: Other specified polyneuropathies.

Additional codes to consider

Codes outside the G62 family considered alongside G62.9.

Consider instead

E11.40: Type 2 diabetes mellitus with diabetic neuropathy, unspecified, which replaces G62.9 when diabetes is the documented etiology.
E10.40: Type 1 diabetes mellitus with diabetic neuropathy, unspecified.
G62.0: Drug-induced polyneuropathy, where a medication is the documented cause.
G62.1: Alcoholic polyneuropathy, where alcohol is the documented cause.
G60-: Hereditary and idiopathic neuropathy, where a hereditary or idiopathic type is documented.
G61-: Inflammatory polyneuropathy, where an inflammatory type is documented.

Sources

All claims on this page derive from government and professional-standards sources.

National Center for Health Statistics. (2026). International classification of diseases, tenth revision, clinical modification (ICD-10-CM) FY2027 files. https://www.cdc.gov/nchs/icd/icd-10-cm/files.html
Centers for Medicare & Medicaid Services and National Center for Health Statistics. (2026). ICD-10-CM official guidelines for coding and reporting FY2027. https://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2027/ICD-10-CM-October-1-2026-FY27-Guidelines.pdf
Centers for Medicare & Medicaid Services. (2025). 2026 model software/ICD-10 mappings. https://www.cms.gov/medicare/payment/medicare-advantage-rates-statistics/risk-adjustment/2026-model-software-icd-10-mappings
Centers for Medicare & Medicaid Services. (2026). MS-DRG classifications and software, version 44. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/ms-drg-classifications-and-software