Robert Zylstra, MD
Internal Medicine Physician · Santa Barbara, CA
Robert Zylstra, MD is an internal medicine physician with a practice address in Santa Barbara, California, and NPI 1174652465, issued on Mar 5, 2007. Check the license (California G36944, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert Zylstra
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G36944 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2495 Glen Albyn Drive, Santa Barbara, CA 93105
- Phone
- (805) 682-0414
- Enumerated
- Mar 5, 2007
- Record last updated
- Mar 17, 2023
- Fax
- (805) 524-0658
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Robert Zylstra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G36944Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
334 Medicare Part D claims for 16 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Escitalopram Oxalate41 claims
- Quetiapine Fumarate31 claims
- Levothyroxine Sodium24 claims
- Eliquis22 claims
- Aripiprazole20 claims
- Metformin Hcl15 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.
Robert Zylstra among 17,696 internal medicine physician records in California
Robert Zylstra, MD 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 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).
129 internal medicine physician records list a practice address in Santa Barbara
They are 129 of the 5,328 NPPES records with a practice address in Santa Barbara, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Barbara → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Laurel Bliss, MDSanta Barbara, CA 931051154368868
- David Dodson, M.DSanta Barbara, CA 931051619943834
- Patrick Frawley, MDSanta Barbara, CA 931051093707358
- Jeffrey Hadsall, M.D.Santa Barbara, CA 931051275641714
- William Koonce, MDSanta Barbara, CA 931051124010095
- Sandra Kramer, MDSanta Barbara, CA 931051104823418
Common questions
What is Robert Zylstra, MD's NPI number?
Robert Zylstra, MD's National Provider Identifier (NPI) is 1174652465, issued on Mar 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert Zylstra, MD located?
The NPPES record lists a practice address at 2495 Glen Albyn Drive, Santa Barbara, CA, 93105. Phone: (805) 682-0414. Providers update this record themselves, so call before visiting.
How can I verify Robert Zylstra, MD's license?
NPPES lists California license number G36944, 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 Robert Zylstra, MD prescribe under Medicare Part D?
In 2024, Robert Zylstra, MD had 334 Medicare Part D claims for 16 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.