Skip to main content

G70.00 ICD-10-CM Code: Myasthenia gravis without (acute) exacerbation

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term · 2 Excludes1
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 75 · RxHCC V08 category 153

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
  • botulism (A05.1, A48.51-A48.52)
  • transient neonatal myasthenia gravis (P94.0)
IncludesWhat this code covers
  • Myasthenia gravis NOS

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 056 — DEGENERATIVE NERVOUS SYSTEM DISORDERS WITH MCC (MDC 01)
  • MS-DRG 057 — DEGENERATIVE NERVOUS SYSTEM DISORDERS WITHOUT MCC (MDC 01)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 196 — Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders

Other models: CMS-HCC V22 HCC 75 · RxHCC V08 HCC 153

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G70.00 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on G70.00 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Myasthenia gravis NOS

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from G70

Coder workflow for G70.00

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

Before you code G70.00

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with G70.00. 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 G70.00’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.

    ReviewA05.1, P94.0

Consider G70.00. 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).
Acuity
Acute or chronic as documented; when both are documented and separate codes exist, both are reported with the acute code first (Guidelines I.B.8).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

Official instructions as workflow

  • Excludes1 — check before selecting G70.00(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with G70.00: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareA05.1, P94.0

    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

Documentation: Both the condition G70.00 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewA05.1, P94.0

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.

Don’t confuse G70.00 with…

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

The codes most likely to be picked instead of G70.00 — 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.

  • A05.1— 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 botulism moves the case to A05.1; the two are not reported together unless documented as unrelated.

    Full comparison: G70.00 vs A05.1 →

  • A48.51— 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 botulism moves the case to A48.51; the two are not reported together unless documented as unrelated.

    Full comparison: G70.00 vs A48.51 →

  • A48.52— 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 botulism moves the case to A48.52; the two are not reported together unless documented as unrelated.

    Full comparison: G70.00 vs A48.52 →

  • P94.0— 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 transient neonatal myasthenia gravis moves the case to P94.0; the two are not reported together unless documented as unrelated.

    Full comparison: G70.00 vs P94.0 →

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.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Myasthenia gravis without (acute) exacerbation is a billable ICD-10-CM diagnosis code (G70.00).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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-derived relationships — computed from published CMS and AHRQ datasets

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 056 (MDC 01), DRG 057 (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):NVS018 — Myopathies (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 CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders) for risk-adjusted payment.

G70.1 — Toxic myoneural disorders, G70.2 — Congenital and developmental myasthenia, G70.80 — Lambert-Eaton syndrome, unspecified, G70.81 — Lambert-Eaton syndrome in disease classified elsewhere, G70.89 — Other specified myoneural disorders, G70.9 — Myoneural disorder, unspecified, G73.1 — Lambert-Eaton syndrome in neoplastic disease, G73.3 — Myasthenic syndromes in other diseases classified elsewhere

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Myasthenia Gravis with (Acute) Exacerbation

Same clinical category (CCSR)

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

G70.01 — Myasthenia gravis with (acute) exacerbation, G70.1 — Toxic myoneural disorders, G70.2 — Congenital and developmental myasthenia, G70.80 — Lambert-Eaton syndrome, unspecified, G70.81 — Lambert-Eaton syndrome in disease classified elsewhere, G70.89 — Other specified myoneural disorders, G70.9 — Myoneural disorder, unspecified, G71.0 — Muscular dystrophy, G71.00 — Muscular dystrophy, unspecified, G71.01 — Duchenne or Becker muscular dystrophy, G71.02 — Facioscapulohumeral muscular dystrophy, G71.031 — Autosomal dominant limb girdle muscular dystrophy, G71.032 — Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction, G71.033 — Limb girdle muscular dystrophy due to dysferlin dysfunction, G71.0340 — Limb girdle muscular dystrophy due to sarcoglycan dysfunction, unspecified, G71.0341 — Limb girdle muscular dystrophy due to alpha sarcoglycan dysfunction, G71.0342 — Limb girdle muscular dystrophy due to beta sarcoglycan dysfunction, G71.0349 — Limb girdle muscular dystrophy due to other sarcoglycan dysfunction, G71.035 — Limb girdle muscular dystrophy due to anoctamin-5 dysfunction, G71.036 — Limb girdle muscular dystrophy due to fukutin related protein dysfunction, +53 more

Same Index main term, other category

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

G56.8 — Other specified mononeuropathies of upper limb (subscapularis), G56.9 — Unspecified mononeuropathy of upper limb (thumb), G57.0 — Lesion of sciatic nerve (sciatic nerve), G57.3 — Lesion of lateral popliteal nerve (peroneal), G57.6 — Lesion of plantar nerve (toe), G57.9 — Unspecified mononeuropathy of lower limb (ankle), G58.9 — Mononeuropathy, unspecified (atrophic), G60.0 — Hereditary motor and sensory neuropathy (Charcot-Marie-Tooth type), G61.0 — Guillain-Barre syndrome (Landry's), G62.2 — Polyneuropathy due to other toxic agents (Jamaica ginger), G71.01 — Duchenne or Becker muscular dystrophy (Duchenne's, due to or associated with, muscular dystrophy), G71.02 — Facioscapulohumeral muscular dystrophy (muscle, muscular NEC, pseudohypertrophic), G71.09 — Other specified muscular dystrophies (pseudohypertrophic), G72.3 — Periodic paralysis (familial), G72.89 — Other specified myopathies (muscle, muscular NEC), G80.0 — Spastic quadriplegic cerebral palsy (spastic, quadriplegic), G80.1 — Spastic diplegic cerebral palsy (cerebrocerebellar, diplegic), G80.9 — Cerebral palsy, unspecified (Clark's), G83.0 — Diplegia of upper limbs (brain, diplegia), G83.1 — Monoplegia of lower limb (leg), +89 more

Contextual Map

Every relationship of G70.00 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.

Hierarchy

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 196 — Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

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. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Erb-Goldflam disease or syndrome[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Goldflam-Erb disease or syndrome[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Myasthenia, gravis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Myasthenia, gravis, pseudoparalytica[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Paralysis, paralytic (complete) (incomplete), asthenic bulbar[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Paralysis, paralytic (complete) (incomplete), bulbospinal[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Syndrome, Hoppe-Goldflam[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Syndrome, pseudoparalytica[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (10)

Change history

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

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (8)

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.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 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 — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "G70.00 — Myasthenia gravis without (acute) exacerbation." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/g70.00-myasthenia-gravis-without-acute-exacerbation

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Myasthenia gravis without (acute) exacerbation

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G70.00 in its code family, with their registry titles.

View all codes in the G70 family