Rosa Lorenia Diaz, M.D.
Obstetrics & Gynecology Physician · Lynn, MA
Rosa Lorenia Diaz, M.D. is an obstetrics & gynecology physician with a practice address in Lynn, Massachusetts, and NPI 1336477009, issued on Nov 18, 2009. Check the license (Massachusetts 252829, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Rosa Lorenia Diaz
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- 252829 MA
A110461 CA
Self-reported in NPPES; status is on the state search - Practice location
- 269 Union St, Lynn, MA 01901
- Phone
- (781) 581-3900
- Enumerated
- Nov 18, 2009
- Record last updated
- Jan 25, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130211000038); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 1,127 in Massachusetts → Look up another NPI →
Also registered at 269 Union St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karla Abad, LCSWClinical Social Worker1598577470
- Aishetu AbubakarRegistered Nurse1306467972
- Mario Acosta, RNCommunity Health Registered Nurse1801486469
- Mary Adinkrah, FNPFamily Nurse Practitioner1265716211
- Gabriela Aguiar OrtegaMental Health Counselor1255952982
- Kathleen AhearnRegistered Nurse1801044466
Verify Rosa Lorenia Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 252829Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
91 Medicare Part D claims for 40 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Yuvafem18 claims
- Estradiol17 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.
Bills Medicare through one group practice
- Mass General Brigham Medical Group Northern Massachusetts IncDanvers, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rosa Lorenia Diaz among 1,127 obstetrics & gynecology physician records in Massachusetts
Rosa Lorenia Diaz, M.D. is one of 1,127 obstetrics & gynecology physician records with a practice address in Massachusetts. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 64% of them.
- NPI issued2009 · 64% of these records are older, 32% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2008 · median 2004 among the 715 with a school on file
- Record last updated2013 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Massachusetts
There are 1,127 obstetrics & gynecology physician records in Massachusetts.
All 1,127 in Massachusetts → Every provider in Lynn → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Kristen Cotter, MDLynn, MA 019011124203161
- Hannah Janoowalla, M.D.Lynn, MA 019011912312398
- Alexy Kochowiec, M.D.Lynn, MA 019011780616227
- Louis Laz, MDLynn, MA 019011114057130
- Matthias Muenzer, MDLynn, MA 019011689655839
- Irina Natapov, M.D.Lynn, MA 019011619979408
- Nicole St Omer Roy, MDLynn, MA 019011861997538
- Janelle Whitney-Nguyen, M.D.Lynn, MA 019011043669823
Common questions
What is Rosa Lorenia Diaz, M.D.'s NPI number?
Rosa Lorenia Diaz, M.D.'s National Provider Identifier (NPI) is 1336477009, issued on Nov 18, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Rosa Lorenia Diaz, M.D. located?
The NPPES record lists a practice address at 269 Union St, Lynn, MA, 01901. Phone: (781) 581-3900. Providers update this record themselves, so call before visiting.
How can I verify Rosa Lorenia Diaz, M.D.'s license?
NPPES lists Massachusetts license number 252829, 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 Rosa Lorenia Diaz, M.D. prescribe under Medicare Part D?
In 2024, Rosa Lorenia Diaz, M.D. had 91 Medicare Part D claims for 40 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.