ICD-10 G46.1
Billable / Specific CCAnterior cerebral artery syndrome
About ICD-10-CM G46.1
ICD-10-CM code G46.1 represents Anterior cerebral artery syndrome. This is a billable/specific code in the Nervous System chapter (block G46). The 2026 edition of ICD-10-CM G46.1 became effective on October 1, 2025.
Coding Tips for G46.1
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G46.1 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inpatient DRG Impact, CC
codes Anterior cerebral artery syndrome. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for G46.1
Local Coverage Determinations (LCDs) from CMS MACs that list G46.1 as a covered diagnosis.
Showing top 10 of 435 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G46.1.
2 Cigna
5 Medicare
CPT Codes Commonly Billed with G46.1
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- C8925 CMS LCD: Billing and Coding: Transesophageal Echocardiography (TEE) CMS LCD
- C8927 CMS LCD: Billing and Coding: Transesophageal Echocardiography (TEE) CMS LCD
- C8926 CMS LCD: Billing and Coding: Transesophageal Echocardiography (TEE) CMS LCD
- 93892 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93888 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93893 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93886 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93897 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93896 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93898 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
Convert G46.1 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 |
|---|---|---|
| G46.1 | 4358 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G46.1
Other codes in section G40-G47 (Episodic and paroxysmal disorders).
ICD-10 G46.1, Billing FAQ
Is ICD-10 code G46.1 billable? +
Yes, G46.1 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Is G46.1 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with G46.1? +
Procedures frequently paired with G46.1 include: C8925, C8927, C8926, 93892, 93888.
What ICD-9 codes does G46.1 map to? +
Per CMS GEMs, G46.1 maps to ICD-9 codes: 4358. 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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