Quick answers
- Does John A. Dieck Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Dieck Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does John A. Dieck Jr. see?
- In 2024, CMS data shows 1,181 Original Medicare patients and 16,660 services for John A. Dieck Jr.. This counts Original Medicare only and measures volume, not quality.
- What is John A. Dieck Jr.'s NPI number?
- 1427059310. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for John A. Dieck Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,181 |
|---|---|
| Services billed to Medicare | 16,660 |
| Different services or procedures | 104 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Injection, inclisiran, 1 mg (J1306)10,224 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,357 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)1,185 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)312 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)308 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease58%
- Arthritis46%
- Atrial fibrillation43%
- Heart failure40%
Hospitals where John A. Dieck Jr. works
Medicare's Facility Affiliation Data lists John A. Dieck Jr. at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ascension Seton SouthwestAustin, TX · Acute Care Hospital · Emergency services: listed by Medicare · CCN 450865
- Baylor Scott & White Medical Center - Marble FallsMarble Falls, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 670108
- Round Rock Medical CenterRound Rock, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450718
- St David's Medical CenterAustin, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450431
- St David's South Austin Medical CenterAustin, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450713
Practice locations
Addresses where John A. Dieck Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 4316 James Casey StAustin, TX 78745 (512) 623‑5300
Group practices
Medicare enrollment lists John A. Dieck Jr. as a member of this group (CMS data updated October 2, 2026).
- St Davids Heart and Vascular PLLC203 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Texas →
Other cardiologists in Austin
Clinicians with the same Medicare primary specialty in Austin, TX — not a recommendation.
Other clinicians in St Davids Heart and Vascular PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1984 (42 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1427059310 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians