13.4 Cardiology Diagnostics and Other Medicine Services
Key Takeaways
- Twelve-lead ECG component codes split tracing (93005) from interpretation (93010); hospitals typically report the tracing on the UB-04 and do not report the global office code 93000 for a facility-performed ECG.
- Stress testing and echocardiography use the same technical-versus-professional logic as radiology: hospital technical on the UB-04, physician 26 on the 1500 when the physician did not furnish the technical component.
- Pacemaker and defibrillator interrogation codes distinguish in-person device evaluation from remote monitoring; report the service the record actually describes.
- Cardiac rehabilitation is a session-based hospital outpatient program (93797 without continuous ECG monitoring, 93798 with it) under CMS direct-supervision rules.
- Vaccines need a product code plus an administration code (Medicare often uses G0008, G0009, or G0010 for influenza, pneumococcal, and hepatitis B administration), and hospital outpatient behavioral health may report psychotherapy on the institutional claim when those services are furnished.
Why Medicine-section cardiology shows up on hospital claims
Quick Answer: Hospital outpatient departments report the technical piece of electrocardiograms, stress tests, and echocardiograms on the UB-04. Physicians report interpretation with modifier 26 or with a professional-only code such as 93010. Do not put office global code 93000 on a typical HOPD tracing. Cardiac rehabilitation, pacemaker interrogation, vaccines plus administration, and hospital outpatient psychotherapy are also Medicine services the facility may report when it furnishes them.
The CPT Medicine section is broader than infusions. For COC candidates, the high-yield hospital outpatient cluster is cardiology diagnostics, device evaluation, cardiac rehabilitation, immunizations, and behavioral health services billed from an HOPD or hospital-based clinic. The professional-versus-technical split you used in radiology applies again. This independent OpenExamPrep section is study material for the COC exam, not an AAPC practice analysis.
Electrocardiograms
The 12-lead electrocardiogram (ECG) family is the cleanest component lesson in Medicine:
- 93000 is the global service: tracing, interpretation, and report, typically when one physician office performs both pieces.
- 93005 is the tracing only (technical).
- 93010 is interpretation and report only (professional).
In the HOPD, nursing or cardiology technicians acquire the tracing on hospital equipment. The hospital reports 93005 on the UB-04. The cardiologist who later signs an interpretation reports 93010. Do not report 93000 as a hospital technical line, and do not append modifier 26 to 93000 to mimic a split that CPT already built into 93005/93010. Rhythm strips use a parallel family (93040–93042) with the same global / tracing / interpretation logic. Serial ECGs during chest-pain evaluation are separate medically necessary tracings, not automatic units of 93000. NCCI still bundles an ECG that is integral to another service (for example, ECG monitoring inherent in cardiac CT codes 75571–75574 per NCCI Chapter IX).
Stress testing
Cardiovascular stress testing splits the same way:
- 93015 complete (supervision, tracing, interpretation, and report)
- 93016 physician supervision only
- 93017 tracing only
- 93018 interpretation and report only
When the hospital owns the treadmill, monitors the patient, and produces the tracing, the facility reports the technical tracing code on the UB-04. The supervising and interpreting physicians report 93016 and/or 93018 according to who actually supervised and who wrote the report. A single physician who performs complete office-based stress testing may use 93015; that global code is the wrong default on a hospital outpatient claim where the hospital furnished the technical work. If a pharmacologic or imaging stress test is combined with echocardiography or nuclear perfusion, report the stress-echo or nuclear family that CPT defines rather than stacking a plain treadmill code with an unrelated complete echo as if they were unrelated extras. Parenthetical notes in the codebook control those combinations.
Echocardiography and the 26/TC rule
Transthoracic echocardiography (for example, a complete echo with spectral and color Doppler when those elements are performed and documented) has an MPFS PC/TC indicator of 1 for many codes: both a professional and a technical component exist. The hospital that owns the ultrasound machine and employs the sonographer reports the echo CPT code on the UB-04 without modifier 26 and typically without modifier TC, matching the radiology hospital rule. The interpreting cardiologist reports the same CPT code with modifier 26 on the CMS-1500. Place of service on the professional claim is the hospital outpatient site where the technical exam occurred, not the cardiologist's home reading station.
Do not report a limited echo plus a complete echo for one protocol that meets the complete-study descriptor. Do not unbundle Doppler add-on codes when the complete code already includes Doppler. Stress echocardiography has its own complete versus component codes; apply the same facility-versus-physician split.
| Service | Hospital UB-04 typical reporting | Physician 1500 typical reporting |
|---|---|---|
| 12-lead ECG | 93005 tracing | 93010 interpretation |
| Exercise stress test | 93017 tracing | 93016 supervision and/or 93018 interpretation |
| Complete transthoracic echo | Echo CPT, no 26/TC | Echo CPT with 26 |
| In-person pacemaker interrogation | Technical device-evaluation code as applicable | Professional interrogation/report component when split |
Pacemaker and defibrillator interrogation
Device evaluation codes distinguish in-person interrogation at a hospital clinic from remote monitoring. An in-person interrogation includes connecting to the device, retrieving stored data, and a physician or qualified health care professional interpretation. Remote interrogation uses a different code family and often a 30- or 90-day reporting period. Report what the record shows: a wound-check visit without electronic interrogation is not a device interrogation; a remote transmission processed on a later date is not converted into an in-person hospital code. Programming changes, when performed, may have distinct codes from interrogation-only services. NCCI will bundle device evaluation into a same-day implant or revision when it is inherent; a distinct later encounter is a different analysis.
Cardiac rehabilitation
Cardiac rehabilitation (CR) is a physician-supervised program furnished in a physician office or a hospital outpatient setting under 42 CFR 410.49. Session codes are 93797 (without continuous ECG monitoring) and 93798 (with continuous ECG monitoring). Intensive cardiac rehabilitation uses HCPCS G0422/G0423. Medicare coverage is session-limited (commonly up to 36 sessions in 36 weeks, with a KX modifier pathway for additional medically necessary sessions up to program limits). Direct supervision applies: a physician must be immediately available. For calendar year 2026, CMS permanently allows virtual direct supervision through real-time audio and video for cardiac rehabilitation, matching the diagnostic-test supervision change; that is a supervision method, not automatic permission to report telehealth CR from every HOPD without checking the current OPPS and telehealth lists. Do not report an ECG 93000 in addition to 93798 for the monitoring that is already in the rehab code.
Vaccines and administration
Immunization coding is always product plus administration, unless a specific payer bundles them. The product is a CPT or HCPCS vaccine code. Administration for many commercial payers uses CPT 90460–90461 (counseling through age 18) or 90471–90474 (non-counseling or adult). For Medicare Part B influenza, pneumococcal, and hepatitis B vaccines, administration is typically G0008, G0009, or G0010 rather than 90471. Diagnosis Z23 is the usual encounter-for-immunization code. Hospital outpatient clinics report both the product and the administration on the UB-04 when the hospital furnishes both. Payment for many preventive vaccine administrations in the HOPD is under OPPS APC logic rather than the Physician Fee Schedule; still report both codes. Do not report a therapeutic injection administration code from the 96372 family in place of a vaccine administration code.
Behavioral health and dialysis at a high level
Hospital outpatient behavioral health departments report psychotherapy and other psychiatric Medicine codes (time-based psychotherapy such as 90832, 90834, 90837, and crisis or group codes when those services are furnished) on the institutional claim. Facility reporting still needs start-stop or duration documentation because psychotherapy is a timed family. Do not report psychotherapy for a social-work care-management call that does not meet the CPT psychiatric-service descriptors. Interactive complexity and add-on psychotherapy codes follow CPT parentheticals; they are not automatic companions to every hospital clinic visit.
Dialysis in the Medicine section is easy to misplace on a COC exam. Maintenance end-stage renal disease (ESRD) dialysis is generally paid under the ESRD prospective payment system, not as a typical OPPS clinic infusion. Hospital outpatient claims may still involve dialysis-related services for acute kidney injury or for patients who are not in the ESRD composite rate. Verify the current OPPS status indicator and CMS dialysis billing instructions rather than treating every hemodialysis code as a packaged hydration encounter or as a chemotherapy-style infusion hierarchy problem. Vascular access procedures for dialysis remain Surgery-section coding.
Hospital outpatient scenario
A hospital cardiology clinic performs a complete transthoracic echo with Doppler and a 12-lead ECG on the same afternoon. The hospital employs the sonographer and ECG technician. A community cardiology group interprets both studies. The HOPD reports the echo CPT code and 93005 on the UB-04 without 26 or TC. The group reports the echo with modifier 26 and 93010. Reporting 93000 or a global echo on the hospital claim, or omitting the ECG because an echo was performed, would be incorrect unless NCCI makes the ECG inherent to a different same-session procedure that actually includes monitoring.
A hospital outpatient department acquires a 12-lead ECG on hospital equipment. A cardiologist who is not employed by the hospital later interprets the tracing. What should the hospital report on the UB-04?
A complete transthoracic echocardiogram with Doppler is performed in a hospital outpatient department and interpreted by a physician group that does not furnish the technical component. Which pair matches the radiology-style 26/TC rule?
A Medicare patient receives an influenza vaccine in a hospital outpatient clinic. The hospital furnishes both the vaccine product and the injection. What belongs on the facility claim?