Hannah Mainstain, FNP-BC
Family Nurse Practitioner · Baltimore, MD
Hannah Mainstain, FNP-BC is a family nurse practitioner with a practice address in Baltimore, Maryland, and NPI 1942857917, issued on Aug 23, 2019. Check the license (Maryland R209667, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Hannah Mainstain
- Credential
- FNP-BC
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- R209667 MD
Self-reported in NPPES; status is on the state search - Practice location
- 2702 Geartner RD, Baltimore, MD 21209
- Phone
- (443) 318-8713
- Enumerated
- Aug 23, 2019
- Record last updated
- Jan 14, 2026
- Fax
- (443) 870-4919
- Medicare enrollment
- Enrolled (PECOS I20250709000979); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 4,124 in Maryland → Look up another NPI →
Verify Hannah Mainstain in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license R209667Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% more Medicare Part D claims than the average family nurse practitioner in 2024
1,935 Medicare Part D claims for 305 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate137 claims
- Atorvastatin Calcium112 claims
- Olmesartan Medoxomil84 claims
- Metoprolol Succinate52 claims
- Omeprazole48 claims
- Levothyroxine Sodium47 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 83.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,568.89
95 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Promed Preferred MD Professional CorporationLutherville, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hannah Mainstain among 4,124 family nurse practitioner records in Maryland
Hannah Mainstain, FNP-BC is one of 4,124 family nurse practitioner records with a practice address in Maryland. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 50% of them.
- NPI issued2019 · 50% of these records are older, 42% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2019 · median 2019 among the 2,370 with a school on file
- Record last updated2026 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
712 family nurse practitioner records list a practice address in Baltimore
They are 712 of the 35,183 NPPES records with a practice address in Baltimore, and 4,124 family nurse practitioner records in Maryland.
All 4,124 in Maryland → Every provider in Baltimore → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Batsheva Berkowitz, CRNPBaltimore, MD 212091629700554
- Katherine De GuzmanBaltimore, MD 212091477893600
- Kevin Donnelly, CRNP-FNPBaltimore, MD 212091740950054
- Frances Eppig, CRNPBaltimore, MD 212091659437564
- Natalie Fortin, CRNP, FNP-BCBaltimore, MD 212091174205546
- Sarah Freburger, NPBaltimore, MD 212091922619246
- Renee Hochman, NPBaltimore, MD 212091245901792
- Sarah HofstetterBaltimore, MD 212091215752035
Common questions
What is Hannah Mainstain, FNP-BC's NPI number?
Hannah Mainstain, FNP-BC's National Provider Identifier (NPI) is 1942857917, issued on Aug 23, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Hannah Mainstain, FNP-BC located?
The NPPES record lists a practice address at 2702 Geartner RD, Baltimore, MD, 21209. Phone: (443) 318-8713. Providers update this record themselves, so call before visiting.
How can I verify Hannah Mainstain, FNP-BC's license?
NPPES lists Maryland license number R209667, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Hannah Mainstain, FNP-BC prescribe under Medicare Part D?
In 2024, Hannah Mainstain, FNP-BC had 1,935 Medicare Part D claims for 305 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
What is Hannah Mainstain, FNP-BC's MIPS final score?
The 2023 MIPS final score is 83.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.