2026 NPPES data Obstetrics & Gynecology Physician NPI 1609830348
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SHIRLEY CHAN

Obstetrics & Gynecology Physician in GLENDALE, 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
95
Medicare Part D claims · 29 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
61%
generic claims · 39% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
97.1217/100
▲ 14 pts above national avg 83.1 · [object Object]
Industry payments
$140.23
6 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

SHIRLEY CHAN reported a CMS MIPS final score of 97.1217/100 — above the 83.1 national average — and filed 95 Medicare Part D claims in 2023.

97.1217/100
MIPS score · +14 vs avg
95
Part D claims, 2023
61%
generic prescribing
Likely
board-certified (heuristic)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

SHIRLEY CHAN's MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

97 Top 15% higher than 85% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). Below this entry. 90–100: 189,403 scored providers (40%). This entry sits in this band. This provider 0 100 every MIPS-scored clinician, bucketed by value

Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Board certification likely (heuristic — not verified)

SHIRLEY CHAN practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about SHIRLEY CHAN?

High performer (top quartile)

NPI registry status

Active

Issued 04/12/2006

NPI 1609830348

Primary specialty

Obstetrics & Gynecology Physician

Mid-sized

44,313 US NPIs in this specialty

Medicare Part D claims

95 47% vs specialty avg

2023 prescription claims

Specialty avg: 179

MIPS final score

97.1217/100 14.02170000000001% pts

Exceptional band

vs 83.1 national avg

Specialty distribution in California

How Obstetrics & Gynecology Physician compares to other specialties among California providers

California providers

Obstetrics & Gynecology Physician share within California

1. Obstetrics & Gynecology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Obstetrics & Gynecology Physician share within California

Medicare quality performance — MIPS

SHIRLEY CHAN's 2023 MIPS final score plotted against the Obstetrics & Gynecology Physician national average

High performer (top quartile)
MIPS Final Score
97.1217/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Obstetrics & Gynecology Physician) — 97.1217/100 vs national avg 83.1

0%100%National avg83%97.1%
MIPS final score (Obstetrics & Gynecology Physician) — 97.1217/100 vs national avg 83.1

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).

SHIRLEY CHAN appears in the CMS NPPES registry as a Obstetrics & Gynecology Physician provider at 1505 WILSON TERRACE, GLENDALE, CA, 91206, with a listed phone of (818) 243-8431. NPI 1609830348 was issued on 04/12/2006. 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 95 prescription claims written by this provider, covering 29 Medicare beneficiaries and totaling roughly $10K in drug spend, split 39% brand-name and 61% 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 97.1217/100 for the 2023 performance year (Quality 84.2434), compared with the national average of 83.1.

Obstetrics & Gynecology Physician is a mid-sized specialty nationwide, with 44,313 enrolled providers across 56 states and an average of 179 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

1505 WILSON TERRACE
GLENDALE, CA 91206

Provider Details

NPI 1609830348
Specialty Obstetrics & Gynecology Physician
Gender Female
NPI Issued 04/12/2006

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

97.1217
Final Score
Avg: 83.1
84.2434
Quality
100
Promoting Interoperability

Reporting: Alternative Payment Model

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 SHIRLEY CHAN. Source: openpaymentsdata.cms.gov.

Total received

$140

Largest payer

Hologic Sales and Service, LLC

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 SHIRLEY CHAN. To verify SHIRLEY CHAN'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

SHIRLEY CHAN — brand share 39.0%
Specialty average (est.)

39% brand-name claims vs 61% generic, on 95 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.

95
Total Claims
$10K
Total Drug Cost
29
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
193
Total Day Supply
5,538
Brand vs Generic
39% brand / 61% generic
Brand Drug Cost
$7K
Generic Drug Cost
$3K

Patient Demographics

Average Patient Age
72.1 years
Avg HCC Risk Score
0.99
Gender Split
100% female / 0% 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
Estradiol (Twice Weekly)
Estradiol
26
Estradiol
13
Progesterone
"Progesterone
N/A

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

Obstetrics & Gynecology Physician Overview

How SHIRLEY CHAN fits within the Obstetrics & Gynecology Physician landscape nationally.

44,313
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider

SHIRLEY CHAN's 95 claims are below the specialty average of 179.

Nearby Obstetrics & Gynecology Physician Providers in California

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

Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is SHIRLEY CHAN's specialty?
SHIRLEY CHAN specializes in Obstetrics & Gynecology Physician and practices in GLENDALE, California.
How much does SHIRLEY CHAN prescribe under Medicare Part D?
In 2023, SHIRLEY CHAN wrote 95 Medicare Part D claims totaling $10K in drug costs for 29 beneficiaries.
What is SHIRLEY CHAN's Medicare quality score?
SHIRLEY CHAN has a CMS MIPS Final Score of 97.1217/100 (Quality: 84.2434). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is SHIRLEY CHAN located?
SHIRLEY CHAN is located at 1505 WILSON TERRACE, GLENDALE, CA, 91206. Phone: (818) 243-8431.
What is SHIRLEY CHAN's NPI number?
SHIRLEY CHAN's National Provider Identifier (NPI) is 1609830348, issued on 04/12/2006.
Does SHIRLEY CHAN prescribe more brand-name or generic drugs?
SHIRLEY CHAN's prescribing is 39% brand-name and 61% generic drugs by claim count, with $7K in brand drug costs.
How many Obstetrics & Gynecology Physician providers are there in the US?
There are 44,313 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does SHIRLEY CHAN prescribe most often?
Based on 2023 Medicare Part D data, SHIRLEY CHAN's most frequently prescribed drugs include Estradiol (Twice Weekly), Estradiol, Progesterone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does SHIRLEY CHAN accept Medicare?
SHIRLEY CHAN appears in CMS Medicare data with 95 Part D claims and 29 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify SHIRLEY CHAN's credentials?
SHIRLEY CHAN's NPI is 1609830348. 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.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) — 2023 performance year.
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