Doctor profile · Federal record
Dr. Margaret-Mary Williams, MD
Internal Medicine Physician (CMS: Internal Medicine) · Brockton, MA
- NPI 1992792055
- Accepts Medicare
- 39 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1 Pearl St, Suite 1400
Brockton, MA 023012864
(508) 897-6200
fax (508) 897-6321
Credentials & registration
- NPI registered
- October 2005 — 21 yrs on file
- Profile last updated
- January 21, 2011
- Year of graduation
- 1987 — 39 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Massachusetts #71259
- Medicaid
- MA #3074749
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1992792055. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
550
Distinct HCPCS
7
Medicare allowed
$64,829
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 346 | 175 | $131 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 109 | 80 | $92 | |
93000 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 25 | 24 | $15 | |
G0008 |
Administration of influenza virus vaccine | 22 | 22 | $31 | |
90694 |
Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage | 19 | 19 | $76 | |
99495 |
Transitional care management services for problem of at least moderate complexity | 15 | 13 | $210 | |
99496 |
Transitional care management services for problem of high complexity | 14 | 13 | $284 |
In context: peer comparison
Among 23 peers in Brockton Internal Medicine Physician, average services per provider: 133. This provider delivers 4.1× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,812
Patients
434
Total drug cost
$25,682
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 277 | 72 | $5,796 |
| Lisinopril | Generic | 227 | 53 | $2,627 |
| Levothyroxine Sodium | Generic | 160 | 38 | $2,237 |
| Amlodipine Besylate | Generic | 151 | 32 | $1,342 |
| Omeprazole | Generic | 140 | 31 | $3,241 |
| Atenolol | Generic | 114 | 25 | $1,069 |
| Hydrochlorothiazide | Generic | 109 | 30 | $381 |
| Losartan Potassium | Generic | 104 | 24 | $1,631 |
| Sertraline Hcl | Generic | 85 | 25 | $1,404 |
| Simvastatin | Generic | 81 | 21 | $1,282 |
Hospital affiliations
Frequently asked questions
What is Dr. Margaret-Mary Williams's medical specialty?
Dr. Margaret-Mary Williams practices Internal Medicine Physician in Brockton, MA.
Where does Dr. Margaret-Mary Williams practice?
Dr. Margaret-Mary Williams practices at 1 Pearl St, Brockton, MA 023012864. Office phone: 5088976200.
What is Dr. Margaret-Mary Williams's NPI?
Dr. Margaret-Mary Williams's National Provider Identifier (NPI) is 1992792055, issued by NPPES.
Does Dr. Margaret-Mary Williams accept Medicare assignment?
Yes. Dr. Margaret-Mary Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Margaret-Mary Williams commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (HCPCS 93000). Source: CMS Medicare Physician & Other Practitioners file.