Masashi Kai

  • Boston, MA
  • Cardiothoracic surgeon
NPI1336391713PAC ID5193905487
Medicare services, 2024
96
Medicare patients, 2024
57
Publications
62
Clinical trials
4
Hospital affiliations
2
Practice address
330 Brookline Avenue, Boston, MA 02215
Practice phone
Call (617) 667-7000
Professional email
Get professional email
Personal email
Get personal email
Mobile number
Get mobile number
Social profiles

Primary practice

Beth Israel Deaconess Medical Center

Hospital · Boston, Massachusetts

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Masashi Kai is a cardiothoracic surgeon in Boston, Massachusetts

Masashi Kai practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health.

Masashi Kai's NPI, 1336391713, was assigned on October 16, 2008. Masashi Kai holds New York license 266182.

NPI and contact details
Medicare PAC ID
5193905487
NPI enumeration date
October 16, 2008
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(617) 667-7000
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
50
Medical school graduation
2002

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Masashi Kai practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts

Masashi Kai's primary practice is Beth Israel Deaconess Medical Center, at 330 Brookline Avenue, Boston, MA 02215 in Suffolk County. The practice phone is (617) 667-7000.

Source: Dmand AI Affiliation Data

Masashi Kai is affiliated with 2 sites of care and 1 medical group

Masashi Kai's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health. Masashi Kai is also affiliated with Mount Auburn Hospital. The medical group on file is Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP).

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Masashi Kai's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Masashi Kai practices, 2 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Beth Israel Deaconess Medical CenterAvailable with a free account
+1 more affiliated siteAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

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Dmand AI maps EHR vendors, IT decision makers and buying committees across Beth Israel Lahey Health and 6.2K+ hospitals, with verified contacts in the same login.

Masashi Kai is one of 166 cardiothoracic surgeons in Massachusetts

Thoracic surgery (cardiothoracic vascular surgery) is Masashi Kai's primary specialty in the NPI Registry, under taxonomy code 208G00000X. Masashi Kai is licensed in New York.

Specialties and state licenses

  • Thoracic surgery (cardiothoracic vascular surgery), New YorkPrimaryLicense 266182 · taxonomy 208G00000X

Cardiothoracic surgeons near Masashi Kai

Counts of cardiothoracic 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

Masashi Kai billed Medicare for 96 services in 2024

CMS data shows 96 Medicare services from Masashi Kai across 5 procedure codes in 2024, for 57 Medicare patients. Medicare paid $45,290 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 202496
Medicare patients57
Paid by Medicare$45,290
Procedure codes5

Masashi Kai's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Surgery
2023: 702024: 9637%

Masashi Kai compared with the Massachusetts median for cardiothoracic surgeons, 2024

  • Masashi Kai
  • Massachusetts median
Medicare services
96vs 19350% below
Medicare patients
57vs 15263% below

Medians across 131 cardiothoracic surgeons in Massachusetts with Dmand AI profiles that report each measure.

Masashi Kai'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.

See all procedures by Masashi Kai

Need commercial claims for Masashi Kai?

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Masashi Kai treated 57 Medicare patients in 2024, average age 73

CMS counts 57 Medicare patients who saw Masashi Kai in 2024. The largest group is 65 to 74, with 29 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.32, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Masashi Kai's median patient age at 73, with 23% women.

Medicare patients, 202457
Average age73
Average risk score1.32

Masashi Kai's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Masashi Kai's Medicare patients by sex, 2024

  • Women1933%
  • Men3867%

Chronic conditions among Masashi Kai's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Ischemic heart disease75%
  4. Heart failure70%
  5. Atrial fibrillation60%
  6. Diabetes53%
  7. Chronic kidney disease49%
  8. Arthritis40%

Share of Medicare patients with each condition. A patient can have several.

Masashi Kai's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 73

Patient panel by sex, all payers

  • Women23%
  • Men76%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Masashi Kai ranks in the 85th percentile for coronary artery bypass graft (cabg) in Medicare

Masashi Kai accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 31 procedures of coronary artery bypass graft (cabg) by Masashi Kai, more than 85% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes

Where Masashi Kai ranks in Medicare procedure volume

Coronary artery bypass graft (CABG)
85th percentile31 procedures

CMS ranks each clinician against every clinician it reports for the same procedure category.

Pacemaker insertion or repair: 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)

For MedTech and pharma teams

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Masashi Kai has 62 publications on record

Dmand AI links 62 papers to Masashi Kai, published from 2012 to 2025. 2022 was the busiest year, with 18. The most frequent topics are Heart-Assist Devices, Extracorporeal Membrane Oxygenation and Heart Transplantation. Masashi Kai has published most often in Ann Thorac Surg. Masashi Kai's most frequent co-authors are Suguru Ohira, MD, PhD, Steven Lansman, MD and Ramin Malekan, MD.

Papers62
Years published2012 to 2025

Masashi Kai's papers by year, 2013 to 2025

Topics Masashi Kai writes about most

  • Heart-Assist Devices
  • Extracorporeal Membrane Oxygenation
  • Heart Transplantation
  • Heart Failure
  • Tissue Donors
  • Perfusion
  • Aortic Dissection
  • Shock, Cardiogenic

Masashi Kai's most frequent co-authors

Recent publications by Masashi Kai

See all 62 publications and co-authors

See who Masashi Kai researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Masashi Kai works with, so you can find a warm path to the right cardiothoracic surgeons.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Masashi Kai has worked on 4 clinical trials

Dmand AI links Masashi Kai to 4 clinical trials. 1 is still active or recruiting. Conditions studied include Heart Failure and Heart Diseases. TransMedics sponsors the most, 3.

Conditions in Masashi Kai's trials

  • Heart Failure
  • Heart Diseases

Investigators on the most trials with Masashi Kai

Recent clinical trials with Masashi Kai

Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)

Masashi Kai received $30,222 in industry payments from 2016 to 2025

CMS Open Payments shows 88 general payments to Masashi Kai from 11 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 44% of the total. Zimmer Biomet Holdings, Inc. paid the most, $23,064. It also lists 4 research payments totaling $298 in 2020.

General payments to Masashi Kai by program year, 2016 to 2025

General payments to Masashi Kai by kind, 2016 to 2025

$30.2Kin total
  • Travel and lodging$13,29944%
  • Consulting fees$13,00043%
  • Food and beverage$3,92313%

Companies that paid Masashi Kai the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Masashi Kai

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Sources for Masashi Kai's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Clinical trials and co-investigatorsDmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Masashi Kai

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Masashi Kai's NPI number?

Masashi Kai's NPI number is 1336391713. It was assigned on October 16, 2008, and it is active in the NPI Registry.

What does Masashi Kai specialize in?

Masashi Kai is a cardiothoracic surgeon in Boston, Massachusetts. The primary specialty in the NPI Registry is Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (taxonomy code 208G00000X).

Where does Masashi Kai practice?

Masashi Kai practices at 330 Brookline Avenue, Boston, MA 02215. Masashi Kai's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health.

What is Masashi Kai's office phone number?

The practice phone on file for Masashi Kai is (617) 667-7000.

What is Masashi Kai's medical license number?

Masashi Kai holds New York license 266182.

Which hospitals is Masashi Kai affiliated with?

Masashi Kai practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts. Masashi Kai is also affiliated with Mount Auburn Hospital.

What medical group is Masashi Kai part of?

Masashi Kai is linked to Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP).

Does Masashi Kai accept Medicare?

Yes. CMS data shows Masashi Kai billed Medicare for 96 services in 2024, and Masashi Kai accepts Medicare assignment.

How many Medicare patients does Masashi Kai see?

CMS counts 57 Medicare patients who saw Masashi Kai in 2024, with an average age of 73.

What services does Masashi Kai bill to Medicare?

In 2024, Masashi Kai's most billed Medicare services were surgery: heart and blood vessels (33508), surgery: heart and blood vessels (33533) and surgery: heart and blood vessels (33518).

Show 4 more questionsShow fewer questions

Has Masashi Kai received payments from drug or device companies?

CMS Open Payments shows $30,222 in general payments to Masashi Kai from 11 companies from 2016 to 2025. The largest total came from Zimmer Biomet Holdings, Inc.

How long has Masashi Kai been practicing?

Masashi Kai graduated from medical school in 2002, 24 years ago.

Does Masashi Kai do research?

Dmand AI links 62 publications to Masashi Kai, published from 2012 to 2025. Masashi Kai has worked on 4 clinical trials.

Who does Masashi Kai publish with?

Masashi Kai's most frequent co-authors are Suguru Ohira, MD, PhD (50 shared papers), Steven Lansman, MD (25 shared papers) and Ramin Malekan, MD (22 shared papers).

Selling to thoracic surgery (cardiothoracic vascular surgery) practices?

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