Dr. John W. Mah, MD
- Medicare services, 2024
- 59
- Medicare patients, 2024
- 32
- MIPS score, 2024
- 93
- Hospital affiliations
- 2
- Industry payments
- $36,604
- Practice address
- 80 Seymour Street, Hartford, CT 06102
- Practice phone
- Call (860) 545-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mah's professional email, personal email and mobile number
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Dr. John W. Mah is a general surgeon in Hartford, Connecticut
Dr. Mah practices at Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare.
Dr. Mah's NPI, 1316040272, was assigned on September 6, 2006. Dr. Mah graduated from Sanford School of Medicine of University of South Dakota in 1998. Dr. Mah holds Connecticut license 041522.
- NPI
- 1316040272NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133199029
- NPI enumeration date
- September 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (860) 545-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John W. Mah practices at Hartford Hospital in Hartford, Connecticut
Dr. Mah's primary practice is Hartford Hospital, at 80 Seymour Street, Hartford, CT 06102 in Hartford County. The practice phone is (860) 545-5000.
- Hartford Hospital80 Seymour Street, Hartford, CT 06102 · Hartford CountyPhone(860) 545-5000
Source: Dmand AI Affiliation Data
Dr. John W. Mah is affiliated with 2 sites of care and 2 medical groups
Dr. Mah's primary practice is Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare. The medical group on file is Hartford Hospital. Dmand AI also links Dr. Mah to 1 more hospital and 1 medical group, each named with a free account. Dr. Mah'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. John W. Mah's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mah practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hartford Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John W. Mah is one of 303 general surgeons in Connecticut
Surgery is Dr. Mah's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Mah is licensed in Connecticut.
Specialties and state licenses
- Surgery, ConnecticutPrimary
General surgeons near Dr. Mah
Counts of general surgeons 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. John W. Mah billed Medicare for 59 services in 2024
CMS data shows 59 Medicare services from Dr. Mah across 1 procedure code in 2024, for 32 Medicare patients. Medicare paid $10,272 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mah's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 682024: 5913%
Dr. Mah compared with the Connecticut median for general surgeons, 2024
- Dr. Mah
- Connecticut median
- Medicare services
- 59vs 10946% below
- Medicare patients
- 32vs 9566% below
Medians across 295 general surgeons in Connecticut with Dmand AI profiles that report each measure.
Dr. Mah'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John W. Mah treated 32 Medicare patients in 2024, average age 72
CMS counts 32 Medicare patients who saw Dr. Mah in 2024. The largest group is 65 to 74, with 14 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 3.32, 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. Mah's median patient age at 63, with 37% women.
Dr. Mah's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Mah's Medicare patients by sex, 2024
- Women1134%
- Men2166%
Chronic conditions among Dr. Mah's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease50%
- Chronic kidney disease47%
- Arthritis44%
- Atrial fibrillation44%
- Heart failure44%
- Mood disorders41%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mah's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women37%
- Men62%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John W. Mah scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Mah for performance year 2024, reported as part of a group. Dr. Mah accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Mah's MIPS scores, performance year 2024
- 93of 100Final score
- 75.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 71of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John W. Mah received $36,604 in industry payments from 2016 to 2023
CMS Open Payments shows 18 general payments to Dr. Mah from 4 drug and device companies from 2016 to 2023. Consulting fees make up the largest share, 89% of the total. Smiths Medical ASD, Inc. paid the most, $33,590.
General payments to Dr. Mah by program year, 2016 to 2023
General payments to Dr. Mah by kind, 2016 to 2023
- Consulting fees$32,47989%
- Travel and lodging$2,3316%
- Royalties and licenses$1,2003%
- Food and beverage$3221%
- Entertainment$2721%
Companies that paid Dr. Mah the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John W. Mah graduated from Sanford School of Medicine of University of South Dakota
Dr. Mah graduated from Sanford School of Medicine of University of South Dakota in 1998.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John W. Mah'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)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. John W. Mah
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. John W. Mah's NPI number?
Dr. John W. Mah's NPI number is 1316040272. It was assigned on September 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John W. Mah?
Dr. John W. Mah is a general surgeon in Hartford, Connecticut. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. John W. Mah practice?
Dr. Mah practices at 80 Seymour Street, Hartford, CT 06102. Dr. Mah's primary practice is Hartford Hospital in Hartford, Connecticut, part of Hartford HealthCare. Dmand AI also links Dr. Mah to 1 hospital and 1 medical group.
What is Dr. John W. Mah's office phone number?
The practice phone on file for Dr. Mah is (860) 545-5000.
What is Dr. John W. Mah's medical license number?
Dr. Mah holds Connecticut license 041522.
Which hospitals is Dr. John W. Mah affiliated with?
Dr. Mah practices at Hartford Hospital in Hartford, Connecticut. Dmand AI links Dr. Mah to 1 more hospital.
What medical group is Dr. John W. Mah part of?
Dr. Mah is linked to Hartford Hospital. Dmand AI links Dr. Mah to 1 more medical group.
Does Dr. John W. Mah accept Medicare?
Yes. CMS data shows Dr. Mah billed Medicare for 59 services in 2024, and Dr. Mah accepts Medicare assignment.
What is Dr. John W. Mah's MIPS score?
Dr. Mah's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.
How many Medicare patients does Dr. John W. Mah see?
CMS counts 32 Medicare patients who saw Dr. Mah in 2024, with an average age of 72.
Show 4 more questionsShow fewer questions
What services does Dr. John W. Mah bill to Medicare?
In 2024, Dr. Mah's most billed Medicare services were critical care (99291).
Where did Dr. John W. Mah go to medical school?
Dr. Mah graduated from Sanford School of Medicine of University of South Dakota in 1998.
Has Dr. John W. Mah received payments from drug or device companies?
CMS Open Payments shows $36,604 in general payments to Dr. Mah from 4 companies from 2016 to 2023. The largest total came from Smiths Medical ASD, Inc.
How long has Dr. John W. Mah been practicing?
Dr. Mah graduated from medical school in 1998, 28 years ago.
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