G0423 HCPCS code: Intensive cardiac rehabilitation; with or without continuous ecg monitoring; without exercise, per session

G0423 is the HCPCS Level II code for intensive cardiac rehabilitation; with or without continuous ecg monitoring; without exercise, per session. In 2024 Medicare paid an average of $103.24 per service for G0423 across 65,588 services. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 6 per day on outpatient hospital claims. Medicare volume rose 67% from 2022 to 2024 (39,320 to 65,588 services). In 2024, about 245 clinicians billed Medicare for G0423 for 3,967 beneficiaries; California, Arkansas, Florida accounted for 38% of services.

Code details

Who bills G0423 (2024)

Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.

Medicare utilization for G0423, 2022–2024

States with the most G0423 services (2024)

NCCI unit limits (MUE)

Medicare policy articles for this code

• A53775: Billing and Coding: Frequency and Duration for Cardiac Rehabilitation and Intensive Cardiac Rehabilitation (Palmetto GBA (MAC - Part A, MAC - Part B))

Covered diagnoses (51 ICD-10-CM codes)

The diagnoses most often listed as covered in the policy articles above:

Showing 10 of 51. The full list, non-covered diagnoses and CSV export are in Caduvo.

What changed for G0423

• 2010-01-01: G0423 added to HCPCS Level II
• Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01

Frequently asked questions

What is HCPCS code G0423?

G0423 is the HCPCS Level II code for intensive cardiac rehabilitation; with or without continuous ecg monitoring; without exercise, per session. Short descriptor: "Intens cardiac rehab no exer".

How much does Medicare pay for G0423?

In 2024, the average Medicare payment was $103.24 per service (average allowed $129.67).

Does Medicare cover G0423?

Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.

Which diagnoses support coverage for G0423?

Medicare policy articles that cite G0423 list 51 covered ICD-10-CM diagnosis codes across 1 article. The most cited include I20.1 (Angina pectoris with documented spasm), I20.2 (Refractory angina pectoris), I20.81 (Angina pectoris with coronary microvascular dysfunction). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.

How many units of G0423 can be billed per day?

6 on outpatient hospital claims; 6 on practitioner claims (NCCI medically unlikely edits).

Related G04 codes

• G0400 — Home sleep test (hst) with type iv portable monitor, unattended; minimum of 3 channels
• G0402 — Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment
• G0403 — Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report
• G0404 — Electrocardiogram, routine ecg with 12 leads; tracing only, without interpretation and report, performed as a screening for the initial preventive physical examination
• G0405 — Electrocardiogram, routine ecg with 12 leads; interpretation and report only, performed as a screening for the initial preventive physical examination
• G0406 — Follow-up inpatient consultation, limited, physicians typically spend 15 minutes communicating with the patient via telehealth
• G0407 — Follow-up inpatient consultation, intermediate, physicians typically spend 25 minutes communicating with the patient via telehealth
• G0408 — Follow-up inpatient consultation, complex, physicians typically spend 35 minutes communicating with the patient via telehealth
• G0409 — Social work and psychological services, directly relating to and/or furthering the patient's rehabilitation goals, each 15 minutes, face-to-face; individual (services provided by a corf-qualified social worker or psychologist in a corf)
• G0410 — Group psychotherapy other than of a multiple-family group, in a partial hospitalization or intensive outpatient setting, approximately 45 to 50 minutes
• G0411 — Interactive group psychotherapy, in a partial hospitalization or intensive outpatient setting, approximately 45 to 50 minutes
• G0412 — Open treatment of iliac spine(s), tuberosity avulsion, or iliac wing fracture(s), unilateral or bilateral for pelvic bone fracture patterns which do not disrupt the pelvic ring includes internal fixation, when performed

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Next steps

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Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.

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