ICD-10 I45.81
Billable / SpecificLong QT syndrome
About ICD-10-CM I45.81
ICD-10-CM code I45.81 represents Long QT syndrome. This is a billable/specific code in the Circulatory System chapter (block I45). The 2026 edition of ICD-10-CM I45.81 became effective on October 1, 2025.
Medicare LCD Coverage for I45.81
Local Coverage Determinations (LCDs) from CMS MACs that list I45.81 as a covered diagnosis.
Showing top 10 of 514 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I45.81.
3 Cigna
5 Medicare
CPT Codes Commonly Billed with I45.81
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- G0448 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33216 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33230 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33244 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33264 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33263 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33220 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33224 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33270 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
- 33272 CMS LCD: Billing and Coding: Implantable Automatic Defibrillators CMS LCD
Convert I45.81 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 |
|---|---|---|
| I45.81 | 42682 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I45.81
Other codes in section I30-I5A (Other forms of heart disease).
ICD-10 I45.81, Billing FAQ
Is ICD-10 code I45.81 billable? +
Yes, I45.81 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 I45.81? +
Procedures frequently paired with I45.81 include: G0448, 33216, 33230, 33244, 33264.
What ICD-9 codes does I45.81 map to? +
Per CMS GEMs, I45.81 maps to ICD-9 codes: 42682. 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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