Adam Giermasz, M.D., PHD
Hematology & Oncology Physician · Sacramento, CA
Adam Giermasz, M.D., PHD is a hematology & oncology physician with a practice address in Sacramento, California, and NPI 1831374644, issued on Dec 31, 2007. Check the license (California A103790, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Adam Giermasz
- Credential
- M.D., PHD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A103790 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2000 Stockton Blvd, Suite 202, Sacramento, CA 95817
- Phone
- (916) 734-3461
- Enumerated
- Dec 31, 2007
- Record last updated
- Sep 18, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (916) 734-3591
- Medicare enrollment
- Enrolled (PECOS I20110831000657); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 2000 Stockton Blvd, Suite 202
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anjlee Mahajan, M.D.Hematology & Oncology Physician1356578454
Verify Adam Giermasz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A103790Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
230 Medicare Part D claims for 56 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 89% of claims.
Most prescribed
- Eliquis176 claims
- Xarelto19 claims
- Hydroxyurea14 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.
Industry payments in 2024: $90,033.40
66 payments; by number, the most common kind was food and beverage; the largest payer was BioMarin Pharmaceutical Inc. The 8,560 providers of this specialty with any payment received $7,481.41 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 2 group practices
- Regents OF The Univ OF CAMerced, CA
- Regents OF The University OF CaliforniaSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
Other hematology & oncology physician records in California
- Mark Abate, M.D.Santa Barbara, CA1588778674
- Iman Abdalla, MDLos Angeles, CA1730248311
- Haifaa Abdulhaq, MDFresno, CA1508024647
- Nihal Abdulla, MDLos Alamitos, CA1750585345
- Mehrad Abedi, M.D.Sacramento, CA1467459222
- Oyewale Abidoye, M.D.La Jolla, CA1790841815
- Mohammed Abu Zaanona, MDSanta Barbara, CA1922591197
- Mohamad Adada, M.D., PHDRoseville, CA1528590734
- Jesse Adams, MDSacramento, CA1851479554
- Thompson Adams, MDSanta Monica, CA1407880891
Common questions
What is Adam Giermasz, M.D., PHD's NPI number?
Adam Giermasz, M.D., PHD's National Provider Identifier (NPI) is 1831374644, issued on Dec 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Adam Giermasz, M.D., PHD located?
The NPPES record lists a practice address at 2000 Stockton Blvd, Suite 202, Sacramento, CA, 95817. Phone: (916) 734-3461. Providers update this record themselves, so call before visiting.
How can I verify Adam Giermasz, M.D., PHD's license?
NPPES lists California license number A103790, 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 Adam Giermasz, M.D., PHD prescribe under Medicare Part D?
In 2024, Adam Giermasz, M.D., PHD had 230 Medicare Part D claims for 56 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.