Dr. William Gee Chang, MD, PhD
- Medicare services, 2022
- 43
- Publications
- 11
- Industry payments
- $82
- Affiliated sites
- 1
- State license
- 1
- Practice address
- 718 Smyth Road, Manchester, NH 03104
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Manchester VA Medical Center - Behavioral Health
Outpatient Addiction Treatment · Manchester, New Hampshire
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Dr. William Gee Chang is a nephrologist in Manchester, New Hampshire
Dr. Chang practices at Manchester VA Medical Center - Behavioral Health in Manchester, New Hampshire.
Dr. Chang's NPI, 1679757629, was assigned on December 27, 2007. Dr. Chang graduated from New York University Grossman School of Medicine in 2006. Dr. Chang holds Connecticut license 049303.
- NPI
- 1679757629NPI Registry (opens in a new tab)
- NPI enumeration date
- December 27, 2007
- NPI status
- Active
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William Gee Chang practices at Manchester VA Medical Center - Behavioral Health in Manchester, New Hampshire
Dr. Chang's primary practice is Manchester VA Medical Center - Behavioral Health, at 718 Smyth Road, Manchester, NH 03104.
- Manchester VA Medical Center - Behavioral Health718 Smyth Road, Manchester, NH 03104
Source: Dmand AI Affiliation Data
Dr. William Gee Chang is affiliated with 1 site of care
Dr. Chang's primary practice is Manchester VA Medical Center - Behavioral Health in Manchester, New Hampshire.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Gee Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Manchester VA Medical Center - Behavioral Health | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Gee Chang is one of 29 nephrologists in New Hampshire
Nephrology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Chang is licensed in Connecticut.
Specialties and state licenses
- Nephrology, ConnecticutPrimary
Nephrologists near Dr. Chang
Counts of nephrologists 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 Gee Chang billed Medicare for 43 services in 2022
CMS data shows 43 Medicare services from Dr. Chang across 2 procedure codes in 2022. Medicare paid $2,183 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chang's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 4032022: 4389%
- Tests and treatments
- 2021: 1322022: 0100%
Dr. Chang compared with the New Hampshire median for nephrologists, 2022
- Dr. Chang
- New Hampshire median
- Medicare services
- 43vs 1,06296% below
Medians across 27 nephrologists in New Hampshire with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2022
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. Chang and other nephrologists in New Hampshire.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Gee Chang's patients have a median age of 88
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 88, with 0% women.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 88
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
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Dr. William Gee Chang has 11 publications on record
Dmand AI links 11 papers to Dr. Chang, published from 2013 to 2021. 2013 was the busiest year, with 2. The most frequent topics are Microvessels, Cells, Cultured and Endothelial Cells. Dr. Chang has published most often in NPJ Regen Med. Dr. Chang's most frequent co-authors are George Tellides, Laura E. Niklason, MD and Alessia Fornoni, MD, PhD.
Dr. Chang's papers by year, 2013 to 2021
Topics Dr. Chang writes about most
- Microvessels
- Cells, Cultured
- Endothelial Cells
- Human Umbilical Vein Endothelial Cells
- Mice, SCID
- Neovascularization, Physiologic
- Paracrine Communication
- Pericytes
Dr. Chang's most frequent co-authors
- George Tellides3 shared papers
- Laura E. Niklason, MD2 shared papers
- Alessia Fornoni, MD, PhD1 shared paper
Recent publications by Dr. Chang
Int J Nephrol Renovasc Dis
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Gee Chang received $82 in industry payments from 2018 to 2025
CMS Open Payments shows 3 general payments to Dr. Chang from 2 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $47.
General payments to Dr. Chang by program year, 2018 to 2025
Companies that paid Dr. Chang the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Gee Chang graduated from New York University Grossman School of Medicine
Dr. Chang graduated from New York University Grossman School of Medicine in 2006.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Gee Chang'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 Data |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Gee Chang
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 Gee Chang's NPI number?
Dr. William Gee Chang's NPI number is 1679757629. It was assigned on December 27, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. William Gee Chang?
Dr. William Gee Chang is a nephrologist in Manchester, New Hampshire. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. William Gee Chang practice?
Dr. Chang practices at 718 Smyth Road, Manchester, NH 03104. Dr. Chang's primary practice is Manchester VA Medical Center - Behavioral Health in Manchester, New Hampshire.
What is Dr. William Gee Chang's medical license number?
Dr. Chang holds Connecticut license 049303.
Does Dr. William Gee Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 43 services in 2022.
What services does Dr. William Gee Chang bill to Medicare?
In 2022, Dr. Chang's most billed Medicare services were hospital inpatient care (99232) and hospital inpatient care (99231).
Where did Dr. William Gee Chang go to medical school?
Dr. Chang graduated from New York University Grossman School of Medicine in 2006.
Has Dr. William Gee Chang received payments from drug or device companies?
CMS Open Payments shows $82 in general payments to Dr. Chang from 2 companies from 2018 to 2025. The largest total came from Pfizer Inc.
How long has Dr. William Gee Chang been practicing?
Dr. Chang graduated from medical school in 2006, 20 years ago.
Does Dr. William Gee Chang do research?
Dmand AI links 11 publications to Dr. Chang, published from 2013 to 2021.
Who does Dr. William Gee Chang publish with?
Dr. Chang's most frequent co-authors are George Tellides (3 shared papers), Laura E. Niklason, MD (2 shared papers) and Alessia Fornoni, MD, PhD (1 shared paper).
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