Hannah Mainstain, FNP-BC
NPI 1942857917 · Family Nurse Practitioner · Baltimore, MD
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hannah Mainstain, FNP-BC is a Family Nurse Practitioner provider in Baltimore, MD (NPI 1942857917).
Provider details
- NPI number
- 1942857917
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- R209667 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
296 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 104 | $64 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 101 | $94 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 52 | $115 |
| Face-To-Face Behavioral Counseling for Obesity, 15 MinutesG0447 | 20 | $22 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 19 | $13 |
Typical Medicare-allowed amounts for these services range $13–$115 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 47 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 137 | 61 |
| Atorvastatin Calcium | 112 | 50 |
| Olmesartan Medoxomil | 84 | 39 |
| Metoprolol Succinate | 52 | 24 |
| Omeprazole | 48 | 14 |
| Levothyroxine Sodium | 47 | 20 |
| Hydrochlorothiazide | 46 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,569 across 95 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-08-23
- Last updated
- 2026-01-14
- Certified
- 2026-01-14
Frequently asked questions
- What is Hannah Mainstain's NPI number?
- Hannah Mainstain's National Provider Identifier (NPI) is 1942857917, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hannah Mainstain's specialty?
- Hannah Mainstain is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Hannah Mainstain located?
- Hannah Mainstain's practice location on file with NPPES is 2702 Geartner Rd, Baltimore, MD 21209-1410.
- What is Hannah Mainstain's phone number?
- The practice phone number listed in the NPPES registry for Hannah Mainstain is (443) 318-8713.
- Does Hannah Mainstain accept Medicare?
- Hannah Mainstain is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hannah Mainstain's NPI active?
- Yes — Hannah Mainstain's NPI (1942857917) is active in the NPPES registry as of the last update on 2026-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.