Rex Werner, O.D.
NPI 1891760716 · Optometrist · El Cajon, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Werner, O.D. is a Optometrist provider in El Cajon, CA (NPI 1891760716).
Provider details
- NPI number
- 1891760716
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- OPT9378TPL (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
757 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Photography of the Retina92250 | 220 | $41 |
| Established Patient Complete Exam of Visual System92014 | 169 | $139 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 73 | $137 |
| Exam of Visual Field With Extended Testing92083 | 56 | $71 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 55 | $97 |
| Imaging of Optic Nerve92133 | 53 | $37 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 81 | 21 |
| Bimatoprostbrand: Lumigan | 22 | — |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 13 | — |
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 no Part D record, 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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$468 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-22
- Last updated
- 2010-08-04
Frequently asked questions
- What is Rex Werner's NPI number?
- Rex Werner's National Provider Identifier (NPI) is 1891760716, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Werner's specialty?
- Rex Werner is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Rex Werner located?
- Rex Werner's practice location on file with NPPES is 2650 Jamacha Rd, El Cajon, CA 92019-4319.
- What is Rex Werner's phone number?
- The practice phone number listed in the NPPES registry for Rex Werner is (619) 670-6296.
- Does Rex Werner accept Medicare?
- Rex Werner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Werner's NPI active?
- Yes — Rex Werner's NPI (1891760716) is active in the NPPES registry as of the last update on 2010-08-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.