Rejan C. McCaskill, M.D., F.A.C.P.
Internal Medicine Physician · Newport Beach, CA
Rejan C. McCaskill, M.D., F.A.C.P. is an internal medicine physician with a practice address in Newport Beach, California, and NPI 1790852606, issued on Nov 29, 2006. Check the license (California A78084, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rejan C. McCaskill
- Credential
- M.D., F.A.C.P.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A78084 CA
Self-reported in NPPES; status is on the state search - Practice location
- 320 Superior Ave Ste 330, Newport Beach, CA 92663
- Phone
- (949) 791-2000
- Enumerated
- Nov 29, 2006
- Record last updated
- Sep 3, 2025
- Fax
- (949) 791-2001
- Medicare enrollment
- Enrolled (PECOS I20080327000738); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 320 Superior Ave Ste 330
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Rejan C. McCaskill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78084Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,012 Medicare Part D claims for 230 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium212 claims
- Rosuvastatin Calcium182 claims
- Amlodipine Besylate180 claims
- Atorvastatin Calcium175 claims
- Losartan Potassium129 claims
- Losartan-Hydrochlorothiazide90 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.
Rejan C. McCaskill among 17,696 internal medicine physician records in California
Rejan C. McCaskill, M.D., F.A.C.P. is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1999 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 internal medicine physician records list a practice address in Newport Beach
They are 94 of the 4,414 NPPES records with a practice address in Newport Beach, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Newport Beach → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Brouwer, MDNewport Beach, CA 926631629018544
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- Gary Carlson, MDNewport Beach, CA 926631497700116
- David Chun, MDNewport Beach, CA 926631730152976
- Dennis Jordanides, M.D.Newport Beach, CA 926631285638031
- Kambiz Karimi, MDNewport Beach, CA 926631720061823
- Gregory Katz, MDNewport Beach, CA 926631184674178
- Cameron Khavarian, M.D.Newport Beach, CA 926631104871938
Common questions
What is Rejan C. McCaskill, M.D., F.A.C.P.'s NPI number?
Rejan C. McCaskill, M.D., F.A.C.P.'s National Provider Identifier (NPI) is 1790852606, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rejan C. McCaskill, M.D., F.A.C.P. located?
The NPPES record lists a practice address at 320 Superior Ave Ste 330, Newport Beach, CA, 92663. Phone: (949) 791-2000. Providers update this record themselves, so call before visiting.
How can I verify Rejan C. McCaskill, M.D., F.A.C.P.'s license?
NPPES lists California license number A78084, 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 Rejan C. McCaskill, M.D., F.A.C.P. prescribe under Medicare Part D?
In 2024, Rejan C. McCaskill, M.D., F.A.C.P. had 3,012 Medicare Part D claims for 230 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.