Adam C. Diehl, MD
Hematology & Oncology Physician · Seattle, WA
Adam C. Diehl, MD is a hematology & oncology physician with a practice address in Seattle, Washington, and NPI 1942549340, issued on Feb 5, 2013. Check the license (Washington MD60829130, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Adam C. Diehl
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- MD60829130 WA
Self-reported in NPPES; status is on the state search - Practice location
- 825 Eastlake Ave. E, Seattle, WA 98109
- Phone
- (206) 520-5000
- Enumerated
- Feb 5, 2013
- Record last updated
- Jun 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210617001177); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 825 Eastlake Ave. E
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rekha Chandran, MDHematology & Oncology Physician1457393878
- Margaret Gosnell, ARNPNurse Practitioner1194476325
- Kimberly Harlow, ARNPNurse Practitioner1417223413
- Jessica Hawley, M.D.Medical Oncology Physician1659663979
- Abigail Hecker, PA-CPhysician Assistant1710638978
Verify Adam C. Diehl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD60829130Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,097 Medicare Part D claims for 129 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 61 claims were for opioids.
Most prescribed
- Hydroxyurea66 claims
- Potassium Chloride62 claims
- Acyclovir59 claims
- Oxycodone Hcl48 claims
- Prednisone48 claims
- Eliquis44 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): 93.1 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).
Bills Medicare through one group practice
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hematology & Oncology Physician providers in Washington
There are 476 hematology & oncology physician records in Washington.
Other hematology & oncology physician records in Washington
- Farnoush Abar, M.D.Seattle, WA1558560342
- Janis AbkowitzSeattle, WA1740366558
- David Aboulafia, MDSeattle, WA1043269392
- Deborah Abrams, M.D.Seattle, WA1902974835
- Oyebimpe Adesina, MDSeattle, WA1184934770
- Shirali AgarwalSeattle, WA1972093052
- Amith Ahluwalia, MDWenatchee, WA1497231773
- Sharmila Ahmed, MDSeattle, WA1073512141
- Hani Alhashmi, M.D.Seattle, WA1841596582
- Naveed Ali, M.D.Seattle, WA1134569692
Common questions
What is Adam C. Diehl, MD's NPI number?
Adam C. Diehl, MD's National Provider Identifier (NPI) is 1942549340, issued on Feb 5, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Adam C. Diehl, MD located?
The NPPES record lists a practice address at 825 Eastlake Ave. E, Seattle, WA, 98109. Phone: (206) 520-5000. Providers update this record themselves, so call before visiting.
How can I verify Adam C. Diehl, MD's license?
NPPES lists Washington license number MD60829130, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Adam C. Diehl, MD prescribe under Medicare Part D?
In 2024, Adam C. Diehl, MD had 1,097 Medicare Part D claims for 129 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Adam C. Diehl, MD's MIPS final score?
The 2023 MIPS final score is 93.1 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.