Quick answers
- Does William J. Rittinger Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Rittinger 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 William J. Rittinger Jr. see?
- In 2024, CMS data shows 317 Original Medicare patients and 405 services for William J. Rittinger Jr.. This counts Original Medicare only and measures volume, not quality.
- What is William J. Rittinger Jr.'s NPI number?
- 1730234618. 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 William J. Rittinger 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 | 317 |
|---|---|
| Services billed to Medicare | 405 |
| Different services or procedures | 83 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)31 services
- Anesthesia for lens surgery (00142)25 services
- Anesthesia for procedure for total knee joint replacement (01402)24 services
- Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)21 services
- Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)16 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%
- Arthritis60%
- Ischemic heart disease38%
- Diabetes37%
- Chronic kidney disease33%
Hospitals where William J. Rittinger Jr. works
Medicare's Facility Affiliation Data lists William J. Rittinger 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 Genesys HospitalGrand Blanc, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230197
- Henry Ford Health Warren HospitalWarren, MI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 230195
- McLaren MacombMount Clemens, MI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 230227
Practice locations
Addresses where William J. Rittinger Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Genesys PkwyGrand Blanc, MI 48439 (810) 606‑5000
- 600 Health Park Blvd, Suite AGrand Blanc, MI 48439 (810) 603‑8200
Group practices
Medicare enrollment lists William J. Rittinger Jr. as a member of this group (CMS data updated October 2, 2026).
- Anesthesia Services Associates PC69 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Grand Blanc
Clinicians with the same Medicare primary specialty in Grand Blanc, MI — not a recommendation.
Other clinicians in Anesthesia Services Associates PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1730234618 |
| 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