G62.81 ICD-10-CM Code: Critical illness polyneuropathy

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G62.81 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on G62.81 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for G62.81

MedCoder structured workflow — derived from this code’s own official record

Before you code G62.81

1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with G62.81. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

   See the official tabular notes

Choose the right path

1. Does the documentation support a condition named in G62.81’s Excludes1 note?
   Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
   No → Continue.

   ReviewM79.2, O26.82, M54.10

Consider G62.81. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

• Excludes1 — check before selecting G62.81(4 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with G62.81: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareM79.2, O26.82, M54.10

  See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Neuropathy, neuropathic, acute motor
• Neuropathy, neuropathic, progressive, inflammatory
• Polyneuropathy (peripheral), critical illness

Don’t confuse G62.81 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of G62.81 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• M79.2— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of neuralgia NOS moves the case to M79.2; the two are not reported together unless documented as unrelated.

  Full comparison: G62.81 vs M79.2 →

• O26.82— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of peripheral neuritis in pregnancy moves the case to O26.82; the two are not reported together unless documented as unrelated.

  Full comparison: G62.81 vs O26.82 →

• M54.10— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of radiculitis NOS moves the case to M54.10; the two are not reported together unless documented as unrelated.

  Full comparison: G62.81 vs M54.10 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name G62.81 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Use Additional Code instructions: R65.11 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction, R65.2 — Severe sepsis.

These codes instruct coders to additionally report this code when it applies.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 110 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 2 MS-DRGs: DRG 073 (MDC 01), DRG 074 (MDC 01).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):NVS015 — Polyneuropathies (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

G57.91 — Unspecified mononeuropathy of right lower limb, G57.92 — Unspecified mononeuropathy of left lower limb, G57.93 — Unspecified mononeuropathy of bilateral lower limbs, G58.0 — Intercostal neuropathy, G58.7 — Mononeuritis multiplex, G58.8 — Other specified mononeuropathies, G58.9 — Mononeuropathy, unspecified, G60.0 — Hereditary motor and sensory neuropathy, G60.1 — Refsum's disease, G60.2 — Neuropathy in association with hereditary ataxia, G60.3 — Idiopathic progressive neuropathy, G60.8 — Other hereditary and idiopathic neuropathies, G60.9 — Hereditary and idiopathic neuropathy, unspecified, G61.81 — Chronic inflammatory demyelinating polyneuritis, G61.82 — Multifocal motor neuropathy, G61.89 — Other inflammatory polyneuropathies, G61.9 — Inflammatory polyneuropathy, unspecified, G62.89 — Other specified polyneuropathies, G62.9 — Polyneuropathy, unspecified, G64 — Other disorders of peripheral nervous system, +89 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Polyneuropathies).

G60.9 — Hereditary and idiopathic neuropathy, unspecified, G61.0 — Guillain-Barre syndrome, G61.1 — Serum neuropathy, G61.81 — Chronic inflammatory demyelinating polyneuritis, G61.82 — Multifocal motor neuropathy, G61.89 — Other inflammatory polyneuropathies, G61.9 — Inflammatory polyneuropathy, unspecified, G62.0 — Drug-induced polyneuropathy, G62.1 — Alcoholic polyneuropathy, G62.2 — Polyneuropathy due to other toxic agents, G62.82 — Radiation-induced polyneuropathy, G62.89 — Other specified polyneuropathies, G62.9 — Polyneuropathy, unspecified, G63 — Polyneuropathy in diseases classified elsewhere, M05.50 — Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified site, M05.511 — Rheumatoid polyneuropathy with rheumatoid arthritis of right shoulder, M05.512 — Rheumatoid polyneuropathy with rheumatoid arthritis of left shoulder, M05.519 — Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified shoulder, M05.521 — Rheumatoid polyneuropathy with rheumatoid arthritis of right elbow, M05.522 — Rheumatoid polyneuropathy with rheumatoid arthritis of left elbow, +42 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Polyneuropathy”, “Neuropathy, neuropathic”; these codes share that main term but sit in a different category of the Tabular List.

G60.1 — Refsum's disease (hypertrophic, Refsum), G60.2 — Neuropathy in association with hereditary ataxia (in association with hereditary ataxia), G60.3 — Idiopathic progressive neuropathy (progressive), G60.8 — Other hereditary and idiopathic neuropathies (sensory), G60.9 — Hereditary and idiopathic neuropathy, unspecified (hereditary), G61.1 — Serum neuropathy (in, serum), G61.81 — Chronic inflammatory demyelinating polyneuritis (inflammatory, chronic demyelinating), G61.82 — Multifocal motor neuropathy (multifocal motor), G61.89 — Other inflammatory polyneuropathies (inflammatory, specified NEC), G61.9 — Inflammatory polyneuropathy, unspecified (inflammatory), G65.1 — Sequelae of other inflammatory polyneuropathy (inflammatory, sequelae), G65.2 — Sequelae of toxic polyneuropathy (lead, sequelae), G90.09 — Other idiopathic peripheral autonomic neuropathy (peripheral, autonomic, idiopathic), G90.9 — Disorder of the autonomic nervous system, unspecified (peripheral, autonomic), H47.01 — Ischemic optic neuropathy (optic, ischemic), M10.00 — Idiopathic gout, unspecified site (peripheral, autonomic, in, gout), M30.0 — Polyarteritis nodosa (in, polyarteritis nodosa), M31.7 — Microscopic polyangiitis (in, microscopic polyangiitis), M32.19 — Other organ or system involvement in systemic lupus erythematosus (in, systemic, lupus erythematosus), M35.9 — Systemic involvement of connective tissue, unspecified (in, collagen vascular disease NEC), +54 more

Contextual Map

Every relationship of G62.81 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run G62.81 with these 2 related codes in Claim Check

Hierarchy

• G00-G99 — Chapter 6: Diseases of the Nervous System (G00-G99) (G00-G99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Use Additional Code instructions

• R65.11 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction[Use Additional Code]: “critical illness polyneuropathy (G62.81)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• R65.2 — Severe sepsis[Use Additional Code]: “critical illness polyneuropathy (G62.81)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• NVS015 — Polyneuropathies[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 073 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITH MCC[MS-DRG]: “CRANIAL AND PERIPHERAL NERVE DISORDERS WITH MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 074 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITHOUT MCC[MS-DRG]: “CRANIAL AND PERIPHERAL NERVE DISORDERS WITHOUT MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,892 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Neuropathy, neuropathic, acute motor[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Neuropathy, neuropathic, progressive, inflammatory[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Polyneuropathy (peripheral), critical illness[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• G62 — Other and unspecified polyneuropathies[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.0 — Drug-induced polyneuropathy[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.1 — Alcoholic polyneuropathy[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.2 — Polyneuropathy due to other toxic agents[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.8 — Other specified polyneuropathies[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.82 — Radiation-induced polyneuropathy[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.89 — Other specified polyneuropathies[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G62.9 — Polyneuropathy, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G62.81 in its code family, with their registry titles.

• G62 — Other and unspecified polyneuropathies
• G62.0 — Drug-induced polyneuropathy
• G62.1 — Alcoholic polyneuropathy
• G62.2 — Polyneuropathy due to other toxic agents
• G62.8 — Other specified polyneuropathies
• G62.82 — Radiation-induced polyneuropathy
• G62.89 — Other specified polyneuropathies
• G62.9 — Polyneuropathy, unspecified

View all codes in the G62 family