Quick answers
- Does Walt Marquardt accept Medicare assignment?
- Yes. Medicare's clinician data says Walt Marquardt 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 Walt Marquardt see?
- In 2024, CMS data shows 1,225 Original Medicare patients and 3,171 services for Walt Marquardt. This counts Original Medicare only and measures volume, not quality.
- What is Walt Marquardt's NPI number?
- 1881766962. 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 Walt Marquardt, 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 | 1,225 |
|---|---|
| Services billed to Medicare | 3,171 |
| Different services or procedures | 81 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)429 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)423 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)373 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)221 services
- Insertion of stents with balloon dilation of coronary artery or branch, single artery or branch (92928)159 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 disease68%
- Arthritis52%
- Atrial fibrillation39%
- Heart failure36%
Hospitals where Walt Marquardt works
Medicare's Facility Affiliation Data lists Walt Marquardt 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.
- Mercy General HospitalSacramento, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050017
- Mercy Hospital of FolsomFolsom, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050414
- Mercy San Juan Medical CenterCarmichael, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050516
- Methodist Hospital of SacramentoSacramento, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050590
- Sierra Nevada Memorial HospitalGrass Valley, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050150
Practice locations
Addresses where Walt Marquardt is enrolled with Medicare (CMS data updated October 2, 2026).
- 150 Catherine Ln, Suite DGrass Valley, CA 95945 (530) 477‑8358
Group practices
Medicare enrollment lists Walt Marquardt as a member of this group (CMS data updated October 2, 2026).
- Dignity Health Medical Foundation1,184 clinicians in the group
Specialties
- Interventional Cardiologyprimary
Find other Interventional Cardiology doctors in California →
Other interventional cardiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Dignity Health Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Pittsburgh School Of Medicine |
| Graduation year | 1981 (45 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) | 1881766962 |
| 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