Ruby Marr, MD
NPI 1952644700 · Internal Medicine Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ruby Marr, MD is a Internal Medicine Physician provider in Ann Arbor, MI (NPI 1952644700).
Provider details
- NPI number
- 1952644700
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301103598 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 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
151 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 67 | $79 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 45 | $119 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 24 | $50 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 15 | $81 |
Typical Medicare-allowed amounts for these services range $50–$119 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-03-30
- Last updated
- 2022-07-21
Frequently asked questions
- What is Ruby Marr's NPI number?
- Ruby Marr's National Provider Identifier (NPI) is 1952644700, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ruby Marr's specialty?
- Ruby Marr is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ruby Marr located?
- Ruby Marr's practice location on file with NPPES is 1500 E Medical Center Drive, Ann Arbor, MI 48109-5352.
- What is Ruby Marr's phone number?
- The practice phone number listed in the NPPES registry for Ruby Marr is (734) 936-5582.
- Does Ruby Marr accept Medicare?
- Ruby Marr is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ruby Marr's NPI active?
- Yes — Ruby Marr's NPI (1952644700) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.