Marcus Calderon, MD
NPI 1639600885 · Internal Medicine Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Calderon, MD is a Internal Medicine Physician provider in Ann Arbor, MI (NPI 1639600885).
Provider details
- NPI number
- 1639600885
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301502127 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
79 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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 79 | $132 |
Typical Medicare-allowed amounts for these services range $132–$132 (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
Additional practice locations (2)
- 1701 N Senate BlvdIndianapolis, IN 46202-1239Phone: (317) 962-8776
- 100 E 77th StNew York, NY 10075-1850Phone: (212) 434-2000
Registry dates
- Enumerated
- 2017-03-21
- Last updated
- 2025-09-05
- Certified
- 2025-09-05
Frequently asked questions
- What is Marcus Calderon's NPI number?
- Marcus Calderon's National Provider Identifier (NPI) is 1639600885, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus Calderon's specialty?
- Marcus Calderon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus Calderon located?
- Marcus Calderon's practice location on file with NPPES is 1500 E Medical Center Dr, Ann Arbor, MI 48109-5000.
- What is Marcus Calderon's phone number?
- The practice phone number listed in the NPPES registry for Marcus Calderon is (734) 936-4000.
- Does Marcus Calderon accept Medicare?
- Marcus Calderon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcus Calderon's NPI active?
- Yes — Marcus Calderon's NPI (1639600885) is active in the NPPES registry as of the last update on 2025-09-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.