Doctor profile · Federal record
Dr. William Grier, M.D
Internal Medicine Physician (CMS: Critical Care (Intensivists)) · Baltimore, MD
- NPI 1740643378
- Accepts Medicare
- MIPS 100.0 / 100 · 2023
- 10 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
22 S Greene St, Room N3E09
Baltimore, MD 212011544
(410) 328-6110 - Additional location
-
301 Hospital Dr
Glen Burnie, MD 210615803
(410) 787-4000
Credentials & registration
- NPI registered
- March 2016 — 10 yrs on file
- Profile last updated
- December 20, 2021
- Year of graduation
- 2016 — 10 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Maryland #D91153
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1740643378. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
443
Distinct HCPCS
10
Medicare allowed
$43,566
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99291 |
Critical care, first 30-74 minutes | 60 | 32 | $225 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 55 | 41 | $136 | |
94726 |
Test to determine lung volumes using sensors | 46 | 45 | $59 | |
94729 |
Test to examine how well the lungs exchange gases | 46 | 45 | $62 | |
94010 |
Test to measure expiratory airflow and volume | 34 | 32 | $29 | |
94010 |
Test to measure expiratory airflow and volume | 31 | 31 | $9 | |
94729 |
Test to examine how well the lungs exchange gases | 28 | 28 | $9 | |
94726 |
Test to determine lung volumes using sensors | 27 | 27 | $12 | |
94060 |
Test to measure expiratory airflow and volume changes before and after medication administration | 23 | 23 | $42 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 19 | 19 | $177 |
In context: peer comparison
Among 363 peers in Baltimore Internal Medicine Physician, average services per provider: 105. This provider delivers 4.2× the peer median.Open Payments
Industry payments received
All-time total
$875
Transactions
2
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Merck Sharp & Dohme LLC | 2 | $875.00 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
147
Patients
33
Total drug cost
$41,919
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 46 | 18 | $1,719 |
| Trelegy Ellipta (Fluticasone/Umeclidin/Vilanter) | Brand | 35 | 0 | $24,503 |
| Prednisone | Generic | 28 | 15 | $176 |
| Breo Ellipta (Fluticasone/Vilanterol) | Brand | 21 | 0 | $9,269 |
| Incruse Ellipta (Umeclidinium Bromide) | Brand | 17 | 0 | $6,252 |
Hospital affiliations
Frequently asked questions
What is Dr. William Grier's medical specialty?
Dr. William Grier practices Internal Medicine Physician in Baltimore, MD.
Where does Dr. William Grier practice?
Dr. William Grier practices at 22 S Greene St, Baltimore, MD 212011544. Office phone: 4103286110.
What is Dr. William Grier's NPI?
Dr. William Grier's National Provider Identifier (NPI) is 1740643378, issued by NPPES.
Does Dr. William Grier accept Medicare assignment?
Yes. Dr. William Grier accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Grier commonly perform?
Top Medicare-reported procedures in 2023: Critical care (HCPCS 99291); Established patient office or other outpatient visit (HCPCS 99214); Test to determine lung volumes using sensors (HCPCS 94726). Source: CMS Medicare Physician & Other Practitioners file.