Quick answers
- Does Cynthia C. Griggs accept Medicare assignment?
- Yes. Medicare's clinician data says Cynthia C. Griggs 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 Cynthia C. Griggs see?
- In 2024, CMS data shows 39 Original Medicare patients and 323 services for Cynthia C. Griggs. This counts Original Medicare only and measures volume, not quality.
- What is Cynthia C. Griggs's NPI number?
- 1154421774. 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 Cynthia C. Griggs, 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 | 39 |
|---|---|
| Services billed to Medicare | 323 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)45 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)40 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)25 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)20 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%
- Chronic kidney disease75%
- Diabetes74%
- Heart failure69%
- High cholesterol67%
- Arthritis59%
Hospitals where Cynthia C. Griggs works
Medicare's Facility Affiliation Data lists Cynthia C. Griggs 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.
- Beaumont Hospital Royal OakRoyal Oak, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230130
- Harper University HospitalDetroit, MI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 230104
- Sinai-Grace HospitalDetroit, MI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 230024
Practice locations
Addresses where Cynthia C. Griggs is enrolled with Medicare (CMS data updated October 2, 2026).
- 18600 James Couzens FwyDetroit, MI 48235 (313) 341‑7870
- 27209 Lahser Rd, Suite 220Southfield, MI 48034 (248) 552‑9050
Group practices
Medicare enrollment lists Cynthia C. Griggs as a member of this group (CMS data updated October 2, 2026).
- CC Griggs Holding, Ltd.2 clinicians in the group
Specialties
- Internal Medicineprimary
- Nephrologyalso
Other internal medicine doctors in Detroit
Clinicians with the same Medicare primary specialty in Detroit, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154421774 |
| 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