William Mugg, MD
NPI 1689761959 · Internal Medicine Physician · So Hadley, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mugg, MD is a Internal Medicine Physician provider in So Hadley, MA (NPI 1689761959).
Provider details
- NPI number
- 1689761959
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 38722 (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
19 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
1,902 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 | 691 | $126 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 197 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 164 | $90 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 160 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 150 | $178 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 120 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 387 | 92 |
| Losartan Potassium | 269 | 67 |
| Metoprolol Succinate | 235 | 52 |
| Omeprazole | 226 | 55 |
| Simvastatin | 222 | 53 |
| Levothyroxine Sodium | 210 | 43 |
| Gabapentin | 194 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-06
- Last updated
- 2013-02-14
Frequently asked questions
- What is William Mugg's NPI number?
- William Mugg's National Provider Identifier (NPI) is 1689761959, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mugg's specialty?
- William Mugg is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Mugg located?
- William Mugg's practice location on file with NPPES is 96 Lyman St, So Hadley, MA 01075.
- What is William Mugg's phone number?
- The practice phone number listed in the NPPES registry for William Mugg is (413) 533-7176.
- Does William Mugg accept Medicare?
- William Mugg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mugg's NPI active?
- Yes — William Mugg's NPI (1689761959) is active in the NPPES registry as of the last update on 2013-02-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.