William Grier, M.D
NPI 1740643378 · Internal Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grier, M.D is a Internal Medicine Physician provider in Baltimore, MD (NPI 1740643378).
Provider details
- NPI number
- 1740643378
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- D91153 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
671 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) |
|---|---|---|
| Test to Examine How Well the Lungs Exchange Gases94729 | 117 | $63 |
| Test to Determine Lung Volumes Using Sensors94726 | 116 | $63 |
| Test to Measure Expiratory Airflow and Volume94010 | 104 | $30 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 69 | $141 |
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 | 53 | $43 |
| Critical Care, First 30-74 Minutes99291 | 45 | $232 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 62 | 15 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 51 | 12 |
| Prednisone | 19 | 12 |
| Fluticasone/Vilanterolbrand: Breo Ellipta | 18 | — |
| Levalbuterol Tartratebrand: Levalbuterol Tartrate Hfa | 17 | — |
| Varenicline Tartrate | 11 | — |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$875 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
Additional practice locations (1)
- 301 Hospital DrGlen Burnie, MD 21061-5803Phone: (410) 787-4000
Registry dates
- Enumerated
- 2016-03-31
- Last updated
- 2021-12-20
- Certified
- 2021-12-20
Frequently asked questions
- What is William Grier's NPI number?
- William Grier's National Provider Identifier (NPI) is 1740643378, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grier's specialty?
- William Grier is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Grier located?
- William Grier's practice location on file with NPPES is 22 S Greene St, Baltimore, MD 21201-1544.
- What is William Grier's phone number?
- The practice phone number listed in the NPPES registry for William Grier is (410) 328-6110.
- Does William Grier accept Medicare?
- William Grier is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grier's NPI active?
- Yes — William Grier's NPI (1740643378) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.