Margaret-Mary Williams, MD
NPI 1992792055 · Internal Medicine Physician · Brockton, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret-Mary Williams, MD is a Internal Medicine Physician provider in Brockton, MA (NPI 1992792055).
Provider details
- NPI number
- 1992792055
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 71259 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
434 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 302 | $130 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 120 | $92 |
| Transitional Care Management Services for Problem of High Complexity99496 | 12 | $283 |
Typical Medicare-allowed amounts for these services range $92–$283 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 75 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 280 | 71 |
| Lisinopril | 199 | 54 |
| Levothyroxine Sodium | 168 | 41 |
| Amlodipine Besylate | 154 | 34 |
| Omeprazole | 123 | 29 |
| Hydrochlorothiazide | 98 | 31 |
| Atenolol | 96 | 23 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-04
- Last updated
- 2011-01-21
Frequently asked questions
- What is Margaret-Mary Williams's NPI number?
- Margaret-Mary Williams's National Provider Identifier (NPI) is 1992792055, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret-Mary Williams's specialty?
- Margaret-Mary Williams is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret-Mary Williams located?
- Margaret-Mary Williams's practice location on file with NPPES is 1 Pearl St, Brockton, MA 02301-2864.
- What is Margaret-Mary Williams's phone number?
- The practice phone number listed in the NPPES registry for Margaret-Mary Williams is (508) 897-6200.
- Does Margaret-Mary Williams accept Medicare?
- Margaret-Mary Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret-Mary Williams's NPI active?
- Yes — Margaret-Mary Williams's NPI (1992792055) is active in the NPPES registry as of the last update on 2011-01-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.