Robert Zylstra, MD
NPI 1174652465 · Internal Medicine Physician · Santa Barbara, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Zylstra, MD is a Internal Medicine Physician provider in Santa Barbara, CA (NPI 1174652465).
Provider details
- NPI number
- 1174652465
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G36944 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Escitalopram Oxalate | 41 |
| Quetiapine Fumarate | 31 |
| Levothyroxine Sodium | 24 |
| Apixabanbrand: Eliquis | 22 |
| Aripiprazole | 20 |
| Metformin Hcl | 15 |
| Trazodone Hcl | 14 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-05
- Last updated
- 2023-03-17
- Certified
- 2023-03-17
Frequently asked questions
- What is Robert Zylstra's NPI number?
- Robert Zylstra's National Provider Identifier (NPI) is 1174652465, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Zylstra's specialty?
- Robert Zylstra is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Zylstra located?
- Robert Zylstra's practice location on file with NPPES is 2495 Glen Albyn Drive, Santa Barbara, CA 93105.
- What is Robert Zylstra's phone number?
- The practice phone number listed in the NPPES registry for Robert Zylstra is (805) 682-0414.
- Does Robert Zylstra accept Medicare?
- Robert Zylstra is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Zylstra's NPI active?
- Yes — Robert Zylstra's NPI (1174652465) is active in the NPPES registry as of the last update on 2023-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.