Dr. William James Mugg, MD
- Medicare services, 2024
- 1,952
- Medicare patients, 2024
- 203
- Part D claims, 2024
- 7,348
- MIPS score, 2024
- 42
- Hospital affiliations
- 1
- Practice address
- 575 Beech Street, Holyoke, MA 01040
- Practice phone
- Call (413) 534-2500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mugg's professional email, personal email and mobile number
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Dr. William James Mugg is an internist in Holyoke, Massachusetts
Dr. Mugg practices at Holyoke Medical Center in Holyoke, Massachusetts, part of Valley Health Systems.
Dr. Mugg's NPI, 1689761959, was assigned on October 6, 2006. Dr. Mugg graduated from University of Michigan Medical School in 1970. Dr. Mugg holds Massachusetts license 38722.
- NPI
- 1689761959NPI Registry (opens in a new tab)
- NPI enumeration date
- October 6, 2006
- NPI status
- Active
- Practice phone
- (413) 534-2500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 82
- Medical school graduation
- 1970
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William James Mugg practices at Holyoke Medical Center in Holyoke, Massachusetts
Dr. Mugg's primary practice is Holyoke Medical Center, at 575 Beech Street, Holyoke, MA 01040 in Hampden County. The practice phone is (413) 534-2500.
- Holyoke Medical Center575 Beech Street, Holyoke, MA 01040 · Hampden CountyPhone(413) 534-2500
Source: Dmand AI Affiliation Data
Dr. William James Mugg is affiliated with 1 site of care and 1 medical group
Dr. Mugg's primary practice is Holyoke Medical Center in Holyoke, Massachusetts, part of Valley Health Systems. The medical group on file is Holyoke Medical Center. Dr. Mugg's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William James Mugg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mugg practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Holyoke Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. William James Mugg is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Mugg's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mugg is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Mugg
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William James Mugg billed Medicare for 1,952 services in 2024
CMS data shows 1,952 Medicare services from Dr. Mugg across 13 procedure codes in 2024, for 203 Medicare patients. Medicare paid $101,391 for them. Every service was in an office.
Dr. Mugg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,2012024: 1,06212%
- Other services
- 2023: 672024: 268300%
- Lab and pathology
- 2023: 2332024: 2497%
- Tests and treatments
- 2023: 1882024: 21012%
- Surgery
- 2023: 2382024: 16332%
Dr. Mugg compared with the Massachusetts median for internists, 2024
- Dr. Mugg
- Massachusetts median
- Medicare services
- 1,952vs 4314.5 times
- Medicare patients
- 203vs 194Close to median
- Part D claims
- 6,820vs 40217.0 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Mugg's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mugg and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William James Mugg treated 203 Medicare patients in 2024, average age 78
CMS counts 203 Medicare patients who saw Dr. Mugg in 2024. The largest group is 75 to 84, with 75 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.20, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mugg's median patient age at 70, with 48% women.
Dr. Mugg's Medicare patients by age, 2024
Dr. Mugg's Medicare patients by sex, 2024
- Women10552%
- Men9848%
Chronic conditions among Dr. Mugg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis40%
- Diabetes36%
- Anxiety30%
- Chronic kidney disease27%
- Atrial fibrillation25%
- Mood disorders23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mugg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women48%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William James Mugg wrote 7,348 Medicare Part D claims in 2024
In 2024, Dr. Mugg wrote 7,348 Medicare Part D claims for 298 patients. 89% of them were for generic drugs. CMS names the drug for 6,820 of them, across 120 drugs with 11 or more claims each, at $468,945 in total drug cost. In 2023, CMS named 6,559 claims across 111 drugs.
Dr. Mugg's Part D claims by kind of drug, 2024
- Generic6,564 claims89%
- Brand-name754 claims10%
- Other30 claims0%
Dr. Mugg's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mugg's Part D claims, 2024
- Opioids6%442 of 7,348 claims
- Antibiotics4%264 of 7,348 claims
- Antipsychotics, patients 65 and over0%28 of 7,348 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,5592024: 6,8204%
Drugs named by CMS: 120 in 2024, 111 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William James Mugg scored 42 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 42 out of 100 for Dr. Mugg for performance year 2024, reported individually.
Dr. Mugg's MIPS scores, performance year 2024
- 42of 100Final score
- 35of 100Quality
- 0of 100Improvement Activities
- 81of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. William James Mugg received $17 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Mugg from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Depomed, Inc. paid the most, $17.
Companies that paid Dr. Mugg the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William James Mugg graduated from University of Michigan Medical School
Dr. Mugg graduated from University of Michigan Medical School in 1970.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William James Mugg's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William James Mugg
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William James Mugg's NPI number?
Dr. William James Mugg's NPI number is 1689761959. It was assigned on October 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William James Mugg?
Dr. William James Mugg is an internist in Holyoke, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William James Mugg practice?
Dr. Mugg practices at 575 Beech Street, Holyoke, MA 01040. Dr. Mugg's primary practice is Holyoke Medical Center in Holyoke, Massachusetts, part of Valley Health Systems.
What is Dr. William James Mugg's office phone number?
The practice phone on file for Dr. Mugg is (413) 534-2500.
What is Dr. William James Mugg's medical license number?
Dr. Mugg holds Massachusetts license 38722.
Which hospitals is Dr. William James Mugg affiliated with?
Dr. Mugg practices at Holyoke Medical Center in Holyoke, Massachusetts.
What medical group is Dr. William James Mugg part of?
Dr. Mugg is linked to Holyoke Medical Center.
Does Dr. William James Mugg accept Medicare?
Yes. CMS data shows Dr. Mugg billed Medicare for 1,952 services in 2024.
What is Dr. William James Mugg's MIPS score?
Dr. Mugg's MIPS final score for performance year 2024 is 42 out of 100, reported individually.
How many Medicare patients does Dr. William James Mugg see?
CMS counts 203 Medicare patients who saw Dr. Mugg in 2024, with an average age of 78.
Show 5 more questionsShow fewer questions
What services does Dr. William James Mugg bill to Medicare?
In 2024, Dr. Mugg's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and office visit, established patient (99213).
Where did Dr. William James Mugg go to medical school?
Dr. Mugg graduated from University of Michigan Medical School in 1970.
What drugs does Dr. William James Mugg prescribe most?
In 2024 Medicare Part D data, Dr. Mugg's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Metoprolol Succinate.
Has Dr. William James Mugg received payments from drug or device companies?
CMS Open Payments shows $17 in general payments to Dr. Mugg from 1 company from 2017 to 2017. The largest total came from Depomed, Inc.
How long has Dr. William James Mugg been practicing?
Dr. Mugg graduated from medical school in 1970, 56 years ago.
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