ICD-10 G70.00
Billable / Specific HCC v28: 75Myasthenia gravis without (acute) exacerbation
About ICD-10-CM G70.00
ICD-10-CM code G70.00 represents Myasthenia gravis without (acute) exacerbation. This is a billable/specific code in the Nervous System chapter (block G70). The 2026 edition of ICD-10-CM G70.00 became effective on October 1, 2025.
Coding Tips for G70.00
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G70.00 is a CMS-HCC v28 risk-adjustment code (category 75). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under G70.00. Per CMS ICD-10-CM Tabular 2026.
- Myasthenia gravis NOS
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for G70.00
Local Coverage Determinations (LCDs) from CMS MACs that list G70.00 as a covered diagnosis.
Showing top 10 of 583 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G70.00.
3 Aetna
2 Cigna
5 Medicare
CPT Codes Commonly Billed with G70.00
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 95910 Nerve conduction study 5-6 — same plus myasthenia gravis Neurology
- J1551 CMS LCD: Billing and Coding: Immune Globulin CMS LCD
- J1559 CMS LCD: Billing and Coding: Immune Globulin CMS LCD
- J1576 CMS LCD: Billing and Coding: Immune Globulin CMS LCD
- J1558 CMS LCD: Billing and Coding: Immune Globulin CMS LCD
- J1555 CMS LCD: Billing and Coding: Immune Globulin CMS LCD
- Q5152 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
- Q5151 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
- J1299 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
- J9190 CMS LCD: Billing and Coding: Chemotherapy Agents for Non-Oncologic Conditions CMS LCD
Convert G70.00 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G70.00 | 35800 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G70.00
Other codes in section G70-G73 (Diseases of myoneural junction and muscle).
ICD-10 G70.00, Billing FAQ
Is ICD-10 code G70.00 billable? +
Yes, G70.00 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to G70.00? +
ICD-10 G70.00 includes: Myasthenia gravis NOS.
Does G70.00 affect Medicare Advantage HCC risk adjustment? +
Yes. G70.00 maps to CMS-HCC v28 category 75. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What CPT codes are commonly billed with G70.00? +
Procedures frequently paired with G70.00 include: 95910, J1551, J1559, J1576, J1558.
What ICD-9 codes does G70.00 map to? +
Per CMS GEMs, G70.00 maps to ICD-9 codes: 35800. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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