Dr. William C. Hillmann, MD
- Medicare services, 2024
- 197
- Medicare patients, 2024
- 72
- Part D claims, 2016
- 150
- Publications
- 7
- Hospital affiliations
- 1
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hillmann's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William C. Hillmann is an internist in Boston, Massachusetts
Dr. Hillmann practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Hillmann's NPI, 1669819892, was assigned on May 29, 2013. Dr. Hillmann graduated from Tufts University School of Medicine in 2013. Dr. Hillmann holds Massachusetts license L-255382.
- NPI
- 1669819892NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507093010
- NPI enumeration date
- May 29, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William C. Hillmann practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Hillmann's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. William C. Hillmann is affiliated with 4 sites of care and 2 medical groups
Dr. Hillmann's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Hillmann to 2 more group practices and clinics, 1 community health center and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William C. Hillmann's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hillmann practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William C. Hillmann is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Hillmann's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Hillmann is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Hillmann
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 C. Hillmann billed Medicare for 197 services in 2024
CMS data shows 197 Medicare services from Dr. Hillmann across 4 procedure codes in 2024, for 72 Medicare patients. Medicare paid $16,727 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Hillmann's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1172024: 19768%
Dr. Hillmann compared with the Massachusetts median for internists, 2024
- Dr. Hillmann
- Massachusetts median
- Medicare services
- 197vs 43154% below
- Medicare patients
- 72vs 19463% below
- Part D claims
- 150vs 40263% below
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Hillmann'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.
Need commercial claims for Dr. Hillmann?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hillmann and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William C. Hillmann treated 72 Medicare patients in 2024, average age 76
CMS counts 72 Medicare patients who saw Dr. Hillmann in 2024. The largest group is 75 to 84, with 23 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 39% are also on Medicaid. Their average risk score is 3.44, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hillmann's median patient age at 65, with 40% women.
Dr. Hillmann's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Hillmann's Medicare patients by sex, 2024
- Women4360%
- Men2940%
Chronic conditions among Dr. Hillmann's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Mood disorders64%
- Anxiety63%
- Chronic kidney disease60%
- Heart failure57%
- Ischemic heart disease57%
- Arthritis51%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hillmann's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women40%
- Men60%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William C. Hillmann wrote 150 Medicare Part D claims in 2016
In 2016, Dr. Hillmann wrote 150 Medicare Part D claims. They cover 10 drugs, with $7,430 in total drug cost.
Dr. Hillmann's most prescribed drugs by claims, 2016
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. William C. Hillmann takes part in Medicare
Dr. Hillmann accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. William C. Hillmann has 7 publications on record
Dmand AI links 7 papers to Dr. Hillmann, published from 2012 to 2024. The most frequent topics are Fever, Medication Reconciliation and Patient Readmission. Dr. Hillmann has published most often in J Gen Intern Med. Dr. Hillmann's most frequent co-authors are Marjory A. Bravard, MD, David J. Lucier, MBA, MD and Amy Wisteria Baughman, MD.
Dr. Hillmann's papers by year, 2012 to 2024
Topics Dr. Hillmann writes about most
- Fever
- Medication Reconciliation
- Patient Readmission
- Pharmacy
- Pharmacy Service, Hospital
Dr. Hillmann's most frequent co-authors
- Marjory A. Bravard, MD3 shared papers
- David J. Lucier, MBA, MD2 shared papers
- Amy Wisteria Baughman, MD1 shared paper
Recent publications by Dr. Hillmann
Jt Comm J Qual Patient Saf
J Gen Intern Med
See who Dr. Hillmann researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hillmann works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William C. Hillmann graduated from Tufts University School of Medicine
Dr. Hillmann graduated from Tufts University School of Medicine in 2013.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William C. Hillmann'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 C. Hillmann
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 C. Hillmann's NPI number?
Dr. William C. Hillmann's NPI number is 1669819892. It was assigned on May 29, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. William C. Hillmann?
Dr. William C. Hillmann is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William C. Hillmann practice?
Dr. Hillmann practices at 55 Fruit Street, Boston, MA 02114. Dr. Hillmann's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Hillmann to 2 group practices and clinics, 1 community health center and 1 medical group.
What is Dr. William C. Hillmann's office phone number?
The practice phone on file for Dr. Hillmann is (617) 726-2000.
What is Dr. William C. Hillmann's medical license number?
Dr. Hillmann holds Massachusetts license L-255382.
Which hospitals is Dr. William C. Hillmann affiliated with?
Dr. Hillmann practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Dr. William C. Hillmann part of?
Dr. Hillmann is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Hillmann to 1 more medical group.
Does Dr. William C. Hillmann accept Medicare?
Yes. CMS data shows Dr. Hillmann billed Medicare for 197 services in 2024, and Dr. Hillmann accepts Medicare assignment.
How many Medicare patients does Dr. William C. Hillmann see?
CMS counts 72 Medicare patients who saw Dr. Hillmann in 2024, with an average age of 76.
What services does Dr. William C. Hillmann bill to Medicare?
In 2024, Dr. Hillmann's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99223).
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Where did Dr. William C. Hillmann go to medical school?
Dr. Hillmann graduated from Tufts University School of Medicine in 2013.
What drugs does Dr. William C. Hillmann prescribe most?
In 2016 Medicare Part D data, Dr. Hillmann's most prescribed drugs by claims were Aripiprazole, Lisinopril and Atorvastatin Calcium.
How long has Dr. William C. Hillmann been practicing?
Dr. Hillmann graduated from medical school in 2013, 13 years ago.
Does Dr. William C. Hillmann do research?
Dmand AI links 7 publications to Dr. Hillmann, published from 2012 to 2024.
Who does Dr. William C. Hillmann publish with?
Dr. Hillmann's most frequent co-authors are Marjory A. Bravard, MD (3 shared papers), David J. Lucier, MBA, MD (2 shared papers) and Amy Wisteria Baughman, MD (1 shared paper).
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