John W. Adamson, MD
Hematology (Internal Medicine) Physician · San Diego, CA
John W. Adamson, MD is a hematology (internal medicine) physician with a practice address in San Diego, California, and NPI 1477504801, issued on May 12, 2006. Check the license (California A20742, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John W. Adamson
- Credential
- MD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- A20742 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8929 University Center LN, San Diego, CA 92122
- Phone
- (858) 405-2272
- Enumerated
- May 12, 2006
- Record last updated
- Nov 12, 2025
- Fax
- (858) 550-9032
- Medicaid ID
- 32601800 WI
- Medicare enrollment
- Enrolled (PECOS I20071031000405); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1962
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 175 in California → Look up another NPI →
Also registered at 8929 University Center LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John W. Adamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A20742Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
289 Medicare Part D claims for 70 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 78% of claims.
Most prescribed
- Eliquis172 claims
- Celecoxib30 claims
- Xarelto28 claims
- Tranexamic Acid25 claims
- Enoxaparin Sodium11 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: $122.73
1 payment: food and beverage; the largest payer was Sobi, Inc. The 721 providers of this specialty with any payment received $13,778.35 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
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John W. Adamson among 175 hematology (internal medicine) physician records in California
John W. Adamson, MD is one of 175 hematology (internal medicine) physician records with a practice address in California. 89% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 65% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated1962 · median 2006 among the 135 with a school on file
- Record last updated2025 · 34% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology (Internal Medicine) Physician providers in California
There are 175 hematology (internal medicine) physician records in California.
All 175 in California → Every provider in San Diego → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Ellen CusanoSan Diego, CA 921211295599447
- Edward Libby, MDSan Diego, CA 921211417978651
- Donald Newman, M.D.San Diego, CA 921231013928803
- Thomas Sweet, MDSan Diego, CA 921301164581732
- Edward Ball, M.D.San Diego, CA 921031093740110
- Carlos Carrera, M.D.San Diego, CA 921031417050345
- Ling Huang, MDSan Diego, CA 921031053930735
- Tammarah SklarzLa Jolla, CA 920371013570241
Common questions
What is John W. Adamson, MD's NPI number?
John W. Adamson, MD's National Provider Identifier (NPI) is 1477504801, issued on May 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John W. Adamson, MD located?
The NPPES record lists a practice address at 8929 University Center LN, San Diego, CA, 92122. Phone: (858) 405-2272. Providers update this record themselves, so call before visiting.
How can I verify John W. Adamson, MD's license?
NPPES lists California license number A20742, 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 John W. Adamson, MD prescribe under Medicare Part D?
In 2024, John W. Adamson, MD had 289 Medicare Part D claims for 70 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. 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.