Naomi Ko, M.D.
Medical Oncology Physician · Boston, MA
Naomi Ko, M.D. is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1043360928, issued on Jan 11, 2007. Check the license (Massachusetts 238926, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Naomi Ko
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 238926 MA
Self-reported in NPPES; status is on the state search - Practice location
- 830 Harrison Ave, Boston, MA 02118
- Phone
- (617) 638-6428
- Enumerated
- Jan 11, 2007
- Record last updated
- Jul 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (617) 638-5756
- Medicaid ID
- 110084111A MA
- Medicare enrollment
- Enrolled (PECOS I20260204000077); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2006
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 830 Harrison Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dina Brauneis, NPFamily Nurse Practitioner1831487065
- Mamie Cantor, PA-CPhysician Assistant1548634363
Verify Naomi Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 238926Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average medical oncology physician in 2024
211 Medicare Part D claims for 49 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Letrozole82 claims
- Dexamethasone13 claims
- Loperamide13 claims
- Prochlorperazine Maleate11 claims
- Spironolactone11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Naomi Ko among 421 medical oncology physician records in Massachusetts
Naomi Ko, M.D. is one of 421 medical oncology physician records with a practice address in Massachusetts. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 49% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2006 · median 2007 among the 291 with a school on file
- Record last updated2014 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Massachusetts
There are 421 medical oncology physician records in Massachusetts.
All 421 in Massachusetts → Every provider in Boston → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Adeboye Adewoye, M.D.Boston, MA 021181316920838
- Karen Antman, M.D.Boston, MA 021181528195401
- Marjory Charlot, M.D.Boston, MA 021181871609644
- Peter Everett, M.D.Boston, MA 021181144495375
- Amy Fallon, MDBoston, MA 021181346223450
- Gretchen Gignac, MDBoston, MA 021181821288960
- Kevan Hartshorn, M.D.Boston, MA 021181700862745
- Adam Lerner, M.D.Boston, MA 021181063460087
Common questions
What is Naomi Ko, M.D.'s NPI number?
Naomi Ko, M.D.'s National Provider Identifier (NPI) is 1043360928, issued on Jan 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Naomi Ko, M.D. located?
The NPPES record lists a practice address at 830 Harrison Ave, Boston, MA, 02118. Phone: (617) 638-6428. Providers update this record themselves, so call before visiting.
How can I verify Naomi Ko, M.D.'s license?
NPPES lists Massachusetts license number 238926, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Naomi Ko, M.D. prescribe under Medicare Part D?
In 2024, Naomi Ko, M.D. had 211 Medicare Part D claims for 49 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.