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Dr. Ann York Kao, MD
NPI1588643282PAC ID4587634290
- Medicare services, 2022
- 36
- Publications
- 2
- Hospital affiliations
- 1
- Industry payments
- $14
- Medical groups
- 2
- 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. Kao's professional email, personal email and mobile number
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Dr. Ann York Kao is an internist in Boston, Massachusetts
Dr. Kao practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Kao's NPI, 1588643282, was assigned on January 11, 2006. Dr. Kao graduated from University of Washington School of Medicine in 2000. Dr. Kao holds Massachusetts license 220229.
NPI and contact details
- NPI
- 1588643282NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4587634290
- NPI enumeration date
- January 11, 2006
- 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
- Female
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ann York Kao practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Kao'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. Ann York Kao is affiliated with 2 sites of care and 2 medical groups
Dr. Kao'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. Kao to 1 more community health center and 1 medical group, each named with a free account.
Massachusetts General Physicians Organization (MGPO)1 community health centerName with a free account1 medical groupName with a free account
See all 4 affiliations for Dr. KaoSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ann York Kao's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kao practices, 2 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 |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Ann York Kao is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Kao's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Kao is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Kao
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
5,528internists in Massachusetts1,712internists in Boston446internists at Massachusetts General Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Ann York Kao billed Medicare for 36 services in 2022
CMS data shows 36 Medicare services from Dr. Kao across 1 procedure code in 2022. Medicare paid $3,190 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202236
Paid by Medicare$3,190
Procedure codes1
Dr. Kao's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 1262022: 3671%
Dr. Kao compared with the Massachusetts median for internists, 2022
- Dr. Kao
- Massachusetts median
- Medicare services
- 36vs 43192% below
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Kao'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.
Need commercial claims for Dr. Kao?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Kao and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ann York Kao's patients have a median age of 19
Across all payers, Dmand AI patient panel data puts Dr. Kao's median patient age at 19, with 55% women.
Dr. Kao's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 19
Patient panel by sex, all payers
- Women55%
- Men45%
Source: Dmand AI Patient Panel Data
How Dr. Ann York Kao takes part in Medicare
Dr. Kao 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. Ann York Kao has 2 publications on record
Dmand AI links 2 papers to Dr. Kao. Dr. Kao's most frequent co-authors are Sarabeth Broder-Fingert, MD, Jocelyn Alexandria Carter, MD and Amita Sharma, MD.
Papers2
Dr. Kao's most frequent co-authors
- Sarabeth Broder-Fingert, MD1 shared paper
- Jocelyn Alexandria Carter, MD1 shared paper
- Amita Sharma, MD1 shared paper
Recent publications by Dr. Kao
Acute Kidney InjuryAnemiaAscites
See who Dr. Kao researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Kao 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. Ann York Kao received $14 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Kao from 1 drug or device company in 2018. Food and beverage make up the largest share, 100% of the total. ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) paid the most, $14.
Companies that paid Dr. Kao the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ann York Kao graduated from University of Washington School of Medicine
Dr. Kao graduated from University of Washington School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ann York Kao'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 |
| 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 |
| 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. Ann York Kao
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. Ann York Kao's NPI number?
Dr. Ann York Kao's NPI number is 1588643282. It was assigned on January 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Ann York Kao?
Dr. Ann York Kao is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Ann York Kao practice?
Dr. Kao practices at 55 Fruit Street, Boston, MA 02114. Dr. Kao's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Kao to 1 community health center and 1 medical group.
What is Dr. Ann York Kao's office phone number?
The practice phone on file for Dr. Kao is (617) 726-2000.
What is Dr. Ann York Kao's medical license number?
Dr. Kao holds Massachusetts license 220229.
Which hospitals is Dr. Ann York Kao affiliated with?
Dr. Kao practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Dr. Ann York Kao part of?
Dr. Kao is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Kao to 1 more medical group.
Does Dr. Ann York Kao accept Medicare?
Yes. CMS data shows Dr. Kao billed Medicare for 36 services in 2022, and Dr. Kao accepts Medicare assignment.
What services does Dr. Ann York Kao bill to Medicare?
In 2022, Dr. Kao's most billed Medicare services were hospital inpatient care (99233).
Where did Dr. Ann York Kao go to medical school?
Dr. Kao graduated from University of Washington School of Medicine in 2000.
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Has Dr. Ann York Kao received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Dr. Kao from 1 company from 2018 to 2018. The largest total came from ZOLL Services LLC (A/K/A ZOLL LifeCor Corp).
How long has Dr. Ann York Kao been practicing?
Dr. Kao graduated from medical school in 2000, 26 years ago.
Does Dr. Ann York Kao do research?
Dmand AI links 2 publications to Dr. Kao.
Who does Dr. Ann York Kao publish with?
Dr. Kao's most frequent co-authors are Sarabeth Broder-Fingert, MD (1 shared paper), Jocelyn Alexandria Carter, MD (1 shared paper) and Amita Sharma, MD (1 shared paper).
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