2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1497876254 MD, PHD
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CANDY CHAN, MD, PHD

Retina Specialist (Ophthalmology) Physician in SOUTH PASADENA, California. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
90
Medicare Part D claims · 31 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
59%
generic claims · 41% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$51.59
2 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: CANDY CHAN, MD, PHD is a Retina Specialist (Ophthalmology) Physician ([object Object]) practicing in SOUTH PASADENA, California with a Medicare Part D prescribing footprint of 90 claims across 31 beneficiaries — 41% brand-name prescribing . Industry payments of $51.59 across 2 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: CANDY CHAN, MD, PHD filed 90 Medicare Part D claims in 2023 across SOUTH PASADENA, California. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board-eligible specialty (heuristic — not verified)

CANDY CHAN, MD, PHD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

CANDY CHAN, MD, PHD at a glance

Quality data not reported

NPI registry status

Active

Issued 04/02/2007

NPI 1497876254

Primary specialty

Retina Specialist (Ophthalmology) Physician

Niche

913 US NPIs in this specialty

Medicare Part D claims

90 84% vs specialty avg

2023 prescription claims

Specialty avg: 558

Specialty distribution in California

How Retina Specialist (Ophthalmology) Physician compares to other specialties among California providers

California providers

Retina Specialist (Ophthalmology) Physician share within California

1. Retina Specialist (Ophthalmology) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Retina Specialist (Ophthalmology) Physician share within California

Specialty board-certification context

Estimated specialty board-certified rate — Retina Specialist (Ophthalmology) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Retina Specialist (Ophthalmology) Physician ABMS/AOA estimate

Est. board-certified rate (Retina Specialist (Ophthalmology) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Retina Specialist (Ophthalmology) Physician) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

CANDY CHAN, MD, PHD is a Retina Specialist (Ophthalmology) Physician provider practicing in SOUTH PASADENA, California, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD, PHD. NPI: 1497876254. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

CANDY CHAN, MD, PHD appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding MD, PHD credentials at 709 FREMONT AVE STE C, SOUTH PASADENA, CA, 91030, with a listed phone of (626) 507-5655. NPI 1497876254 was issued on 04/02/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CHAN most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 90 prescription claims written by this provider, covering 31 Medicare beneficiaries and totaling roughly $9K in drug spend, split 41% brand-name and 59% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Retina Specialist (Ophthalmology) Physician is a narrow specialty nationwide, with 913 enrolled providers across 48 states and an average of 558 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

709 FREMONT AVE STE C
SOUTH PASADENA, CA 91030

Provider Details

NPI 1497876254
Specialty Retina Specialist (Ophthalmology) Physician
Credentials MD, PHD
Gender Female
NPI Issued 04/02/2007

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for CANDY CHAN, MD, PHD. Source: openpaymentsdata.cms.gov.

Total received

$52

Largest payer

Regeneron Healthcare Solutions, Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

License & disciplinary context — California MBC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 — they are NOT specific to CANDY CHAN, MD, PHD. To verify CANDY CHAN, MD, PHD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases

MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Above average

CANDY CHAN, MD, PHD — brand share 41.0%
Specialty average (est.)

41% brand-name claims vs 59% generic, on 90 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

90
Total Claims
$9K
Total Drug Cost
31
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
136
Total Day Supply
3,702
Brand vs Generic
41% brand / 59% generic
Brand Drug Cost
$5K
Generic Drug Cost
$4K

Patient Demographics

Average Patient Age
73.5 years
Avg HCC Risk Score
1.25
Gender Split
42% female / 58% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Prednisolone Acetate
14
Dorzolamide-Timolol
Dorzolamide Hcl/Timolol Maleat
12

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Retina Specialist (Ophthalmology) Physician Overview

How CANDY CHAN, MD, PHD fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.

913
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
558
Avg Claims per Provider

CANDY CHAN, MD, PHD's 90 claims are below the specialty average of 558.

Nearby Retina Specialist (Ophthalmology) Physician Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as CHAN.

Compare Retina Specialist (Ophthalmology) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is CANDY CHAN, MD, PHD's specialty?
CANDY CHAN, MD, PHD specializes in Retina Specialist (Ophthalmology) Physician and practices in SOUTH PASADENA, California. Credentials: MD, PHD.
How much does CANDY CHAN, MD, PHD prescribe under Medicare Part D?
In 2023, CANDY CHAN, MD, PHD wrote 90 Medicare Part D claims totaling $9K in drug costs for 31 beneficiaries.
Where is CANDY CHAN, MD, PHD located?
CANDY CHAN, MD, PHD is located at 709 FREMONT AVE STE C, SOUTH PASADENA, CA, 91030. Phone: (626) 507-5655.
What is CANDY CHAN, MD, PHD's NPI number?
CANDY CHAN, MD, PHD's National Provider Identifier (NPI) is 1497876254, issued on 04/02/2007.
Does CANDY CHAN, MD, PHD prescribe more brand-name or generic drugs?
CANDY CHAN, MD, PHD's prescribing is 41% brand-name and 59% generic drugs by claim count, with $5K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US?
There are 913 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 558 Medicare Part D claims per year.
What drugs does CANDY CHAN, MD, PHD prescribe most often?
Based on 2023 Medicare Part D data, CANDY CHAN, MD, PHD's most frequently prescribed drugs include Prednisolone Acetate, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does CANDY CHAN, MD, PHD accept Medicare?
CANDY CHAN, MD, PHD appears in CMS Medicare data with 90 Part D claims and 31 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CANDY CHAN, MD, PHD's credentials?
CANDY CHAN, MD, PHD's NPI is 1497876254 with credentials MD, PHD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology