Crystal Chen, O.D.
NPI 1588841365 · Optometrist · Stockton, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Crystal Chen, O.D. is a Optometrist provider in Stockton, CA (NPI 1588841365).
Provider details
- NPI number
- 1588841365
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 12114 (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 tenure38% of score
18 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) | Beneficiaries |
|---|---|---|
| Latanoprost | 125 | 28 |
| Cyclosporine | 53 | 17 |
| Erythromycin Basebrand: Erythromycin | 52 | 40 |
| Fluorometholone | 36 | 25 |
| Bimatoprostbrand: Lumigan | 17 | — |
| Timolol Maleate | 17 | — |
| Brimonidine Tartrate | 16 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include 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
- 2008-01-24
- Last updated
- 2011-06-02
Frequently asked questions
- What is Crystal Chen's NPI number?
- Crystal Chen's National Provider Identifier (NPI) is 1588841365, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Crystal Chen's specialty?
- Crystal Chen is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Crystal Chen located?
- Crystal Chen's practice location on file with NPPES is 36 W Yokuts Ave Ste 1, Stockton, CA 95207-5713.
- What is Crystal Chen's phone number?
- The practice phone number listed in the NPPES registry for Crystal Chen is (209) 952-3700.
- Does Crystal Chen accept Medicare?
- Crystal Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Crystal Chen's NPI active?
- Yes — Crystal Chen's NPI (1588841365) is active in the NPPES registry as of the last update on 2011-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.