Masha Matvey Nakelchik, M.D.
Internal Medicine Physician · San Jose, CA
Masha Matvey Nakelchik, M.D. is an internal medicine physician with a practice address in San Jose, California, and NPI 1255346623, issued on Jul 31, 2006. Check the license (California A73689, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Masha Matvey Nakelchik
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A73689 CA
Self-reported in NPPES; status is on the state search - Practice location
- 295 Oconnor Dr, San Jose, CA 95128
- Phone
- (408) 279-8173
- Enumerated
- Jul 31, 2006
- Record last updated
- Sep 15, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050419000936); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 295 Oconnor Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Cahn, MDSpecialist1689762205
- Jean Luong, M.DInternal Medicine Physician1780615641
Verify Masha Matvey Nakelchik in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A73689Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average internal medicine physician in 2024
10,476 Medicare Part D claims for 711 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 219 claims were for opioids.
Most prescribed
- Atorvastatin Calcium807 claims
- Amlodipine Besylate472 claims
- Levothyroxine Sodium432 claims
- Losartan Potassium401 claims
- Hydrochlorothiazide270 claims
- Metoprolol Succinate265 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.
The MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $4,181.07
184 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Hamilton Avenue Medical Group IncSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Masha Matvey Nakelchik among 17,696 internal medicine physician records in California
Masha Matvey Nakelchik, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1990 · median 2004 among the 11,065 with a school on file
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
428 internal medicine physician records list a practice address in San Jose
They are 428 of the 20,925 NPPES records with a practice address in San Jose, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Jose → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alfonso Banuelos, MDSan Jose, CA 951281295720613
- Kimberly Bazar, MDSan Jose, CA 951281447225206
- Andrea Cervenka, MDSan Jose, CA 951281609841774
- Stephanie Chan, MDSan Jose, CA 951281639144538
- Alexander Chyorny, MDSan Jose, CA 951281750358016
- Sarah Cody, MDSan Jose, CA 951281568425437
- Vijaya Dudyala, M.DSan Jose, CA 951281477522589
- Eamonn Dunphy, MDSan Jose, CA 951281003878182
Common questions
What is Masha Matvey Nakelchik, M.D.'s NPI number?
Masha Matvey Nakelchik, M.D.'s National Provider Identifier (NPI) is 1255346623, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Masha Matvey Nakelchik, M.D. located?
The NPPES record lists a practice address at 295 Oconnor Dr, San Jose, CA, 95128. Phone: (408) 279-8173. Providers update this record themselves, so call before visiting.
How can I verify Masha Matvey Nakelchik, M.D.'s license?
NPPES lists California license number A73689, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Masha Matvey Nakelchik, M.D. prescribe under Medicare Part D?
In 2024, Masha Matvey Nakelchik, M.D. had 10,476 Medicare Part D claims for 711 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Masha Matvey Nakelchik, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.