Crystal I. Chen, O.D.
Optometrist · Stockton, CA
Crystal I. Chen, O.D. is an optometrist with a practice address in Stockton, California, and NPI 1588841365, issued on Jan 24, 2008. Check the license (California 12114, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Crystal I. Chen
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 12114 CA
Self-reported in NPPES; status is on the state search - Practice location
- 36 W Yokuts Ave Ste 1, Stockton, CA 95207
- Phone
- (209) 952-3700
- Enumerated
- Jan 24, 2008
- Record last updated
- Jun 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080514000442); accepts Medicare assignment
- Medical or professional school
- Ohio State University - College Of Optometry, 1998
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 36 W Yokuts Ave Ste 1
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Angela Maharaj-Gill, O.D.Optometrist1780099903
- Ethan Tittler, M.D.Ophthalmology Physician1649562406
- Sina Vahedi, M.D.Glaucoma Specialist (Ophthalmology) Physician1679005219
Verify Crystal I. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 12114Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average optometrist in 2024
330 Medicare Part D claims for 95 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of claims.
Most prescribed
- Latanoprost125 claims
- Cyclosporine53 claims
- Erythromycin52 claims
- Fluorometholone36 claims
- Lumigan17 claims
- Timolol Maleate17 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.
Bills Medicare through one group practice
- County OF San MateoSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Crystal I. Chen among 8,308 optometrist records in California
Crystal I. Chen, O.D. is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 54% of them.
- NPI issued2008 · 54% of these records are older, 43% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1998 · median 2008 among the 3,573 with a school on file
- Record last updated2011 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in Stockton → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- David Benkle, O.D.Stockton, CA 952071669452801
- Michael Klopping, O.D.Stockton, CA 952071851326185
- Mark Komure, O.D.Stockton, CA 952071689707713
- Derron Lee, O.D.Stockton, CA 952071144313552
- Abraham Magallanez, O.D.Stockton, CA 952071144255449
- Ralph Miranda, O.D.Stockton, CA 952071730197807
- Michael Molamphy, O.D..Stockton, CA 952071609903848
- Whitney Ng, O.D.Stockton, CA 952071467503953
Common questions
What is Crystal I. Chen, O.D.'s NPI number?
Crystal I. Chen, O.D.'s National Provider Identifier (NPI) is 1588841365, issued on Jan 24, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Crystal I. Chen, O.D. located?
The NPPES record lists a practice address at 36 W Yokuts Ave Ste 1, Stockton, CA, 95207. Phone: (209) 952-3700. Providers update this record themselves, so call before visiting.
How can I verify Crystal I. Chen, O.D.'s license?
NPPES lists California license number 12114, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Crystal I. Chen, O.D. prescribe under Medicare Part D?
In 2024, Crystal I. Chen, O.D. had 330 Medicare Part D claims for 95 beneficiaries; the average among optometrist prescribers was 277. 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.