ICD-10 G56.42
Billable / SpecificCausalgia of left upper limb
About ICD-10-CM G56.42
ICD-10-CM code G56.42 represents Causalgia of left upper limb. This is a billable/specific code in the Nervous System chapter (block G56). The 2026 edition of ICD-10-CM G56.42 became effective on October 1, 2025.
Medicare LCD Coverage for G56.42
Local Coverage Determinations (LCDs) from CMS MACs that list G56.42 as a covered diagnosis.
Showing top 10 of 737 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G56.42.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with G56.42
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 64596 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64598 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64570 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64597 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64569 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64581 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64590 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64555 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64595 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
- 64585 CMS LCD: Billing and Coding: Peripheral Nerve Stimulation CMS LCD
Convert G56.42 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 |
|---|---|---|
| G56.42 | 3544 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G56.42
Other codes in section G50-G59 (Nerve, nerve root and plexus disorders).
ICD-10 G56.42, Billing FAQ
Is ICD-10 code G56.42 billable? +
Yes, G56.42 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with G56.42? +
Procedures frequently paired with G56.42 include: 64596, 64598, 64570, 64597, 64569.
What ICD-9 codes does G56.42 map to? +
Per CMS GEMs, G56.42 maps to ICD-9 codes: 3544. 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 May 31, 2026.
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