Alexander C. Black, MD
Hematology & Oncology Physician · Santa Clarita, CA
Alexander C. Black, MD is a hematology & oncology physician with a practice address in Santa Clarita, California, and NPI 1104851500, issued on Jul 12, 2006. Check the license (California G58928, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alexander C. Black
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- G58928 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27235 Tourney RD Ste 2400, Santa Clarita, CA 91355
- Phone
- (661) 255-5350
- Enumerated
- Jul 12, 2006
- Record last updated
- Jan 7, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (661) 255-9907
- Medicaid ID
- 00G589280 CA
- Medicare enrollment
- Enrolled (PECOS I20040115000476); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 27235 Tourney RD Ste 2400
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katherine Cohen, FNP-CHematology & Oncology Physician1043753650
- Gregory Senofsky, MDSurgical Oncology Physician1982792891
Verify Alexander C. Black in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G58928Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,223 Medicare Part D claims for 292 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 23 claims were for opioids.
Most prescribed
- Eliquis79 claims
- Anastrozole72 claims
- Tamoxifen Citrate62 claims
- Gabapentin53 claims
- Dexamethasone46 claims
- Prednisone45 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 practice group's MIPS final score for 2023 (Medicare payment program): 86.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $132.25
3 payments; by number, the most common kind was food and beverage; the largest payer was Intuitive Surgical, 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 one group practice
- The Regents OF The University OF CaliforniaSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander C. Black among 1,583 hematology & oncology physician records in California
Alexander C. Black, MD is one of 1,583 hematology & oncology physician records with a practice address in California. 83% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 54% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1983 · median 2003 among the 1,124 with a school on file
- Record last updated2020 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Santa Clarita → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- John Barstis, MDValencia, CA 913551528093085
- Katherine Cohen, FNP-CSanta Clarita, CA 913551043753650
- Christopher Foss, MDSanta Clarita, CA 913551629431044
- George Hajjar, MDSanta Clarita, CA 913551619978715
- Thomas Joseph, MDSanta Clarita, CA 913551861430092
- Siddharth Kunte, M.D.Santa Clarita, CA 913551639585870
- Nu Lu, MDValencia, CA 913551710196910
- Vincent Louie Mendiola, M.D.Santa Clarita, CA 913551922534866
Common questions
What is Alexander C. Black, MD's NPI number?
Alexander C. Black, MD's National Provider Identifier (NPI) is 1104851500, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alexander C. Black, MD located?
The NPPES record lists a practice address at 27235 Tourney RD Ste 2400, Santa Clarita, CA, 91355. Phone: (661) 255-5350. Providers update this record themselves, so call before visiting.
How can I verify Alexander C. Black, MD's license?
NPPES lists California license number G58928, 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 Alexander C. Black, MD prescribe under Medicare Part D?
In 2024, Alexander C. Black, MD had 1,223 Medicare Part D claims for 292 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Alexander C. Black, MD's MIPS final score?
The 2023 MIPS final score is 86.1 of 100, reported for the practice group. 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.