Doctor profile · Federal record
Dr. William Tollefsen, MD
Emergency Medicine Physician (CMS: Emergency Medicine) · Worcester, MA
- NPI 1841462876
- Accepts Medicare
- MIPS 79.9 / 100 · 2023
- 18 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
119 Belmont St, Department of Emergency Medicine
Worcester, MA 016052903
(508) 421-1400
fax (508) 421-1490 - Mailing address
-
Po Box 415348
Boston, MA 022415348
Credentials & registration
- NPI registered
- March 2008 — 18 yrs on file
- Profile last updated
- November 13, 2012
- Year of graduation
- 2008 — 18 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- Massachusetts #243758
- Medicaid
- MA #110091833A
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1841462876. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
407
Distinct HCPCS
10
Medicare allowed
$57,615
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 168 | 167 | $183 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 55 | 49 | $128 | |
99284 |
Emergency department visit with moderate level of medical decision making | 44 | 43 | $126 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 33 | 33 | $171 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 18 | 17 | $90 | |
81002 |
Urinalysis, manual test | 17 | 14 | $3 | |
99291 |
Critical care, first 30-74 minutes | 17 | 17 | $225 | |
G0008 |
Administration of influenza virus vaccine | 16 | 16 | $34 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 15 | 15 | $115 | |
71046 |
X-ray of chest, 2 views | 12 | 12 | $27 |
In context: peer comparison
Among 82 peers in Worcester Emergency Medicine Physician, average services per provider: 70. This provider delivers 5.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
22
Patients
22
Total drug cost
$841
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Cefpodoxime Proxetil | Generic | 11 | 11 | $765 |
| Doxycycline Hyclate | Generic | 11 | 11 | $77 |
Hospital affiliations
Frequently asked questions
What is Dr. William Tollefsen's medical specialty?
Dr. William Tollefsen practices Emergency Medicine Physician in Worcester, MA.
Where does Dr. William Tollefsen practice?
Dr. William Tollefsen practices at 119 Belmont St, Worcester, MA 016052903. Office phone: 5084211400.
What is Dr. William Tollefsen's NPI?
Dr. William Tollefsen's National Provider Identifier (NPI) is 1841462876, issued by NPPES.
Does Dr. William Tollefsen accept Medicare assignment?
Yes. Dr. William Tollefsen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Tollefsen commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Established patient office or other outpatient visit (HCPCS 99214); Emergency department visit with moderate level of medical decision making (HCPCS 99284). Source: CMS Medicare Physician & Other Practitioners file.