Kay Negishi
- Medicare services, 2024
- 204
- Medicare patients, 2024
- 151
- Part D claims, 2024
- 302
- Hospital affiliations
- 1
- Medical groups
- 7
- 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
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Kay Negishi is an internist in Boston, Massachusetts
Kay Negishi practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Kay Negishi's NPI, 1194103309, was assigned on May 8, 2015. Kay Negishi graduated from Pennsylvania State University College of Medicine in 2015. Kay Negishi holds Massachusetts license 273937.
- NPI
- 1194103309NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789987454
- NPI enumeration date
- May 8, 2015
- 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
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Kay Negishi practices at Massachusetts General Hospital in Boston, Massachusetts
Kay Negishi'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
Kay Negishi is affiliated with 3 sites of care and 7 medical groups
Kay Negishi's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Massachusetts General Hospital. Dmand AI also links Kay Negishi to 6 more medical groups, 1 community health center and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Kay Negishi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Kay Negishi practices, 3 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 |
| +2 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Kay Negishi is one of 5,528 internists in Massachusetts
Internal medicine is Kay Negishi's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Kay Negishi is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Kay Negishi
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
Kay Negishi billed Medicare for 204 services in 2024
CMS data shows 204 Medicare services from Kay Negishi across 6 procedure codes in 2024, for 151 Medicare patients. Medicare paid $16,211 for them. Every service was in a facility, such as a hospital, rather than an office.
Kay Negishi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2162024: 2046%
Kay Negishi compared with the Massachusetts median for internists, 2024
- Kay Negishi
- Massachusetts median
- Medicare services
- 204vs 43153% below
- Medicare patients
- 151vs 19422% below
- Part D claims
- 129vs 40268% below
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Kay Negishi'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
Kay Negishi treated 151 Medicare patients in 2024, average age 74
CMS counts 151 Medicare patients who saw Kay Negishi in 2024. The largest group is 65 to 74, with 56 patients. 75% of them have high blood pressure, and 58% have diabetes. 38% are also on Medicaid. Their average risk score is 2.20, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Kay Negishi's median patient age at 51, with 58% women.
Kay Negishi's Medicare patients by age, 2024
Kay Negishi's Medicare patients by sex, 2024
- Women8657%
- Men6543%
Chronic conditions among Kay Negishi's Medicare patients, 2024
- High blood pressure75%
- Diabetes58%
- High cholesterol56%
- Arthritis51%
- Chronic kidney disease34%
- Mood disorders30%
- Ischemic heart disease27%
- Depression26%
Share of Medicare patients with each condition. A patient can have several.
Kay Negishi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Kay Negishi wrote 302 Medicare Part D claims in 2024
In 2024, Kay Negishi wrote 302 Medicare Part D claims for 64 patients. 75% of them were for generic drugs. CMS names the drug for 129 of them, across 9 drugs with 11 or more claims each, at $13,827 in total drug cost. In 2023, CMS named 16 claims across 1 drug.
Kay Negishi's Part D claims by kind of drug, 2024
- Generic225 claims75%
- Brand-name and other77 claims25%
Kay Negishi'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 162024: 129706%
Drugs named by CMS: 9 in 2024, 1 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
How Kay Negishi takes part in Medicare
Kay Negishi 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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Kay Negishi graduated from Pennsylvania State University College of Medicine
Kay Negishi graduated from Pennsylvania State University College of Medicine in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Kay Negishi'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 | Doctors and Clinicians National Downloadable File (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 Kay Negishi
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Kay Negishi's NPI number?
Kay Negishi's NPI number is 1194103309. It was assigned on May 8, 2015, and it is active in the NPI Registry.
What does Kay Negishi specialize in?
Kay Negishi is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Kay Negishi practice?
Kay Negishi practices at 55 Fruit Street, Boston, MA 02114. Kay Negishi's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Kay Negishi to 6 medical groups, 1 community health center and 1 group practice or clinic.
What is Kay Negishi's office phone number?
The practice phone on file for Kay Negishi is (617) 726-2000.
What is Kay Negishi's medical license number?
Kay Negishi holds Massachusetts license 273937.
Which hospitals is Kay Negishi affiliated with?
Kay Negishi practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Kay Negishi part of?
Kay Negishi is linked to Massachusetts General Hospital. Dmand AI links Kay Negishi to 6 more medical groups.
Does Kay Negishi accept Medicare?
Yes. CMS data shows Kay Negishi billed Medicare for 204 services in 2024, and Kay Negishi accepts Medicare assignment.
How many Medicare patients does Kay Negishi see?
CMS counts 151 Medicare patients who saw Kay Negishi in 2024, with an average age of 74.
What services does Kay Negishi bill to Medicare?
In 2024, Kay Negishi's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99215) and hospital inpatient care (99232).
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Where did Kay Negishi go to medical school?
Kay Negishi graduated from Pennsylvania State University College of Medicine in 2015.
What drugs does Kay Negishi prescribe most?
In 2024 Medicare Part D data, Kay Negishi's most prescribed drugs by claims were Gabapentin, Losartan Potassium and Atorvastatin Calcium.
How long has Kay Negishi been practicing?
Kay Negishi graduated from medical school in 2015, 11 years ago.
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