Margaret Mallari, DO
NPI 1124518519 · Internal Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Mallari, DO is a Internal Medicine Physician provider in Baltimore, MD (NPI 1124518519).
Provider details
- NPI number
- 1124518519
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,214 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) |
|---|---|---|
| Prolonged Hospital Inpatient Or Observation Care Evaluation and Management Service(s) Beyond the Total Time for the Primary Service (when the Primary Service Has Been Selected Using Time on the Date of the Primary Service); Each Additional 15 Minutes By ThG0316 | 724 | $31 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 399 | $120 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 50 | $115 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 41 | $177 |
Typical Medicare-allowed amounts for these services range $31–$177 (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 (1)
- 1925 Pacific AveAtlantic City, NJ 08401-6713Phone: (609) 449-4391
Registry dates
- Enumerated
- 2018-05-11
- Last updated
- 2021-09-08
- Certified
- 2021-09-08
Frequently asked questions
- What is Margaret Mallari's NPI number?
- Margaret Mallari's National Provider Identifier (NPI) is 1124518519, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Mallari's specialty?
- Margaret Mallari is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Mallari located?
- Margaret Mallari's practice location on file with NPPES is 5200 Eastern Ave Fl East2, Baltimore, MD 21224-2734.
- What is Margaret Mallari's phone number?
- The practice phone number listed in the NPPES registry for Margaret Mallari is (410) 550-5018.
- Does Margaret Mallari accept Medicare?
- Margaret Mallari is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Mallari's NPI active?
- Yes — Margaret Mallari's NPI (1124518519) is active in the NPPES registry as of the last update on 2021-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.