Marrissa Baker, M.D.
NPI 1669771986 · Emergency Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marrissa Baker, M.D. is a Emergency Medicine Physician provider in Baltimore, MD (NPI 1669771986).
Provider details
- NPI number
- 1669771986
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- D0079093 (MD)
Specialties & taxonomies
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
15 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
53 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 31 | $181 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 22 | $8 |
Typical Medicare-allowed amounts for these services range $8–$181 (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
- 2011-03-25
- Last updated
- 2017-10-13
Frequently asked questions
- What is Marrissa Baker's NPI number?
- Marrissa Baker's National Provider Identifier (NPI) is 1669771986, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marrissa Baker's specialty?
- Marrissa Baker is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marrissa Baker located?
- Marrissa Baker's practice location on file with NPPES is Johns Hopkins University School of Medicine, Baltimore, MD 21287-0020.
- What is Marrissa Baker's phone number?
- The practice phone number listed in the NPPES registry for Marrissa Baker is (410) 955-5107.
- Does Marrissa Baker accept Medicare?
- Marrissa Baker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marrissa Baker's NPI active?
- Yes — Marrissa Baker's NPI (1669771986) is active in the NPPES registry as of the last update on 2017-10-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.