Mary Diehn, M.D.
NPI 1780029777 · Family Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Diehn, M.D. is a Family Medicine Physician provider in Baltimore, MD (NPI 1780029777).
Provider details
- NPI number
- 1780029777
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- 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 tenure33% of score
13 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 184 | 26 |
| Gabapentin | 86 | 14 |
| Amlodipine Besylate | 86 | 11 |
| Lisinopril | 81 | — |
| Losartan Potassium | 77 | 12 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 69 | 18 |
| Carvedilol |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$121 across 2 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
- 2013-05-03
- Last updated
- 2022-09-06
- Certified
- 2022-09-06
Frequently asked questions
- What is Mary Diehn's NPI number?
- Mary Diehn's National Provider Identifier (NPI) is 1780029777, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Diehn's specialty?
- Mary Diehn is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Diehn located?
- Mary Diehn's practice location on file with NPPES is 9000 Franklin Square Dr, Baltimore, MD 21237-3901.
- What is Mary Diehn's phone number?
- The practice phone number listed in the NPPES registry for Mary Diehn is (443) 777-2000.
- Does Mary Diehn accept Medicare?
- Mary Diehn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Diehn's NPI active?
- Yes — Mary Diehn's NPI (1780029777) is active in the NPPES registry as of the last update on 2022-09-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.