Doctor profile · Federal record
Dr. William Twaddell, M.D.
Anatomic Pathology & Clinical Pathology Physician (CMS: Pathology) · Anatomic Pathology Physician · Baltimore, MD
- NPI 1538296124
- Accepts Medicare
- 22 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
22 S Greene St, Nbw73
Baltimore, MD 212011544
(410) 328-5555
fax (410) 328-0929
Credentials & registration
- NPI registered
- February 2007 — 19 yrs on file
- Profile last updated
- January 25, 2011
- Year of graduation
- 2004 — 22 yrs since
- Specialty taxonomy
- 207ZP0102X — NUCC code
- State licenses (2)
- Maryland #D68076 · New York #242497-1
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1538296124. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,733
Distinct HCPCS
10
Medicare allowed
$79,242
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 781 | 381 | $38 | |
88307 |
Pathology examination of tissue using a microscope, moderately high complexity | 189 | 151 | $85 | |
88331 |
Pathology examination of specimen during surgery, first tissue block | 164 | 62 | $64 | |
88313 |
Special stained specimen slides to examine tissue including interpretation and report | 112 | 37 | $12 | |
88342 |
Special stained specimen slides to examine tissue, initial procedure | 106 | 81 | $35 | |
88341 |
Special stained specimen slides to examine tissue, each additional procedure | 91 | 36 | $29 | |
88304 |
Pathology examination of tissue using a microscope, moderately low complexity | 90 | 78 | $12 | |
88309 |
Pathology examination of tissue using a microscope, high complexity | 86 | 80 | $149 | |
88311 |
Preparation of tissue for examination by removing any calcium present | 68 | 63 | $13 | |
88300 |
Pathology examination of tissue using a microscope, limited examination | 28 | 27 | $5 |
In context: peer comparison
Among 49 peers in Baltimore Anatomic Pathology & Clinical Pathology Physician, average services per provider: 135. This provider delivers 13× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. William Twaddell's medical specialty?
Dr. William Twaddell practices Anatomic Pathology & Clinical Pathology Physician in Baltimore, MD.
Where does Dr. William Twaddell practice?
Dr. William Twaddell practices at 22 S Greene St, Baltimore, MD 212011544. Office phone: 4103285555.
What is Dr. William Twaddell's NPI?
Dr. William Twaddell's National Provider Identifier (NPI) is 1538296124, issued by NPPES.
Does Dr. William Twaddell accept Medicare assignment?
Yes. Dr. William Twaddell accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Twaddell commonly perform?
Top Medicare-reported procedures in 2023: Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Pathology examination of tissue using a microscope, moderately high complexity (HCPCS 88307); Pathology examination of specimen during surgery, first tissue block (HCPCS 88331). Source: CMS Medicare Physician & Other Practitioners file.