Margaret L. Mason
Nurse Practitioner · Baltimore, MD
Margaret L. Mason is a nurse practitioner with a practice address in Baltimore, Maryland, and NPI 1033610746, issued on Feb 27, 2018. Check the license (Maryland R238423, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret L. Mason
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- R238423 MD
3012124 KY
0024177540 VA
Self-reported in NPPES; status is on the state search - Practice location
- 2525 W Belvedere Ave, Baltimore, MD 21215
- Phone
- (410) 367-9100
- Enumerated
- Feb 27, 2018
- Record last updated
- Mar 12, 2026
- Medicare enrollment
- Enrolled (PECOS I20260320002614); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 1,248 in Maryland → Look up another NPI →
Also registered at 2525 W Belvedere Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Feinberg, MS, OTR/LOccupational Therapist1588146054
- Sarvari Kunta, PTPhysical Therapist1205318466
- Chaya Porter, MS-CCC-SLPSpeech-Language Pathologist1972085264
- Rachel Vaquerano, CCC-SLPSpeech-Language Pathologist1487409165
Verify Margaret L. Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license R238423Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average nurse practitioner in 2024
461 Medicare Part D claims for 38 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Potassium Chloride43 claims
- Mirtazapine33 claims
- Multaq26 claims
- Gabapentin20 claims
- Lisinopril20 claims
- Allopurinol19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Universal Health CorporationColonial Beach, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret L. Mason among 1,248 nurse practitioner records in Maryland
Margaret L. Mason is one of 1,248 nurse practitioner records with a practice address in Maryland. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 55% of them.
- NPI issued2018 · 55% of these records are older, 41% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2017 · median 2018 among the 655 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
366 nurse practitioner records list a practice address in Baltimore
They are 366 of the 35,183 NPPES records with a practice address in Baltimore, and 1,248 nurse practitioner records in Maryland.
All 1,248 in Maryland → Every provider in Baltimore → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Hannelore Bloom, CRNPBaltimore, MD 212151720241623
- Richard Burdick, CRNPBaltimore, MD 212151548219702
- Stephanie Entrup, CRNPBaltimore, MD 212151184674491
- Natalia FeiginBaltimore, MD 212151912391004
- Lois Freeman, CRNPBaltimore, MD 212151104922913
- Stacy Gwatura, CRNPBaltimore, MD 212151952764854
- Chloe Parker, NPBaltimore, MD 212151508251240
- Anne-Marie Sack, CRNPBaltimore, MD 212151699003517
Common questions
What is Margaret L. Mason's NPI number?
Margaret L. Mason's National Provider Identifier (NPI) is 1033610746, issued on Feb 27, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Margaret L. Mason located?
The NPPES record lists a practice address at 2525 W Belvedere Ave, Baltimore, MD, 21215. Phone: (410) 367-9100. Providers update this record themselves, so call before visiting.
How can I verify Margaret L. Mason's license?
NPPES lists Maryland license number R238423, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Margaret L. Mason prescribe under Medicare Part D?
In 2024, Margaret L. Mason had 461 Medicare Part D claims for 38 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.