Crystal Ritsema, M.D.
NPI 1093958548 · Internal Medicine Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Crystal Ritsema, M.D. is a Internal Medicine Physician provider in Grand Rapids, MI (NPI 1093958548).
Provider details
- NPI number
- 1093958548
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 4301108709 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
104 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 77 | $91 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 27 | $124 |
Typical Medicare-allowed amounts for these services range $91–$124 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 57 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 151 | 43 |
| Atorvastatin Calcium | 138 | 43 |
| Rosuvastatin Calcium | 99 | 37 |
| Amlodipine Besylate | 93 | 29 |
| Lisinopril | 87 | 30 |
| Omeprazole | 72 | 25 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-04-14
- Last updated
- 2025-01-13
- Certified
- 2025-01-13
Frequently asked questions
- What is Crystal Ritsema's NPI number?
- Crystal Ritsema's National Provider Identifier (NPI) is 1093958548, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Crystal Ritsema's specialty?
- Crystal Ritsema is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Crystal Ritsema located?
- Crystal Ritsema's practice location on file with NPPES is 275 Michigan St Ne, Grand Rapids, MI 49503-2531.
- What is Crystal Ritsema's phone number?
- The practice phone number listed in the NPPES registry for Crystal Ritsema is (616) 397-3777.
- Does Crystal Ritsema accept Medicare?
- Crystal Ritsema is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Crystal Ritsema's NPI active?
- Yes — Crystal Ritsema's NPI (1093958548) is active in the NPPES registry as of the last update on 2025-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.