2026 NPPES data Geriatric Medicine (Family Medicine) Physician NPI 1083994487 D.O.
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JEANINE PHAN, D.O.

Geriatric Medicine (Family Medicine) Physician in SAN JOSE, 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
10K
Medicare Part D claims · 830 beneficiaries · Geriatric Medicine (Family Medicine) Physician avg: 5K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

JEANINE PHAN, D.O. filed 10,097 Medicare Part D claims in 2023 as a Geriatric Medicine (Family Medicine) Physician in SAN JOSE, California, prescribing 91% generic.

10K
Part D claims, 2023
91%
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.

JEANINE PHAN, D.O.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

10,097 Top 2% higher than 98% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. 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 Medicare Part D Prescriber Public Use File · 2023

Board certification likely (heuristic — not verified)

JEANINE PHAN, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — 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 JEANINE PHAN, D.O.?

Quality data not reported

NPI registry status

Active

Issued 08/17/2011

NPI 1083994487

Primary specialty

Geriatric Medicine (Family Medicine) Physician

Niche

1,779 US NPIs in this specialty

Medicare Part D claims

10,097 108% vs specialty avg

2023 prescription claims

Specialty avg: 4,854

Specialty distribution in California

How Geriatric Medicine (Family Medicine) Physician compares to other specialties among California providers

California providers

Geriatric Medicine (Family Medicine) Physician share within California

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

Specialty board-certification context

Estimated specialty board-certified rate — Geriatric Medicine (Family Medicine) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Geriatric Medicine (Family Medicine) Physician ABMS/AOA estimate

Est. board-certified rate (Geriatric Medicine (Family Medicine) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Geriatric Medicine (Family Medicine) 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).

JEANINE PHAN, D.O. appears in the CMS NPPES registry as a Geriatric Medicine (Family Medicine) Physician provider holding D.O. credentials at 275 HOSPITAL PKWY, SAN JOSE, CA, 95119, with a listed phone of (408) 972-3000. NPI 1083994487 was issued on 08/17/2011. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what PHAN 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 10,097 prescription claims written by this provider, covering 830 Medicare beneficiaries and totaling roughly $546K in drug spend, split 9% brand-name and 91% generic by claim count, with an opioid prescribing rate of 2.8%. 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.

Geriatric Medicine (Family Medicine) Physician is a narrow specialty nationwide, with 1,779 enrolled providers across 52 states and an average of 4,854 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

275 HOSPITAL PKWY
SAN JOSE, CA 95119

Provider Details

NPI 1083994487
Specialty Geriatric Medicine (Family Medicine) Physician
Credentials D.O.
Gender Female
NPI Issued 08/17/2011

Hospital and facility affiliations

Facilities where JEANINE PHAN, D.O. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

PERMANENTE MEDICAL GROUP INC
SAN JOSE, CA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

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 JEANINE PHAN, D.O.. To verify JEANINE PHAN, D.O.'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 · Generic-heavy

JEANINE PHAN, D.O. — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 10,097 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.

10,097
Total Claims
$546K
Total Drug Cost
830
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
25,262
Total Day Supply
738,263
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$343K
Generic Drug Cost
$200K
Opioid Claims
283 (2.8% rate)
Antibiotic Claims
269

Patient Demographics

Average Patient Age
84.8 years
Avg HCC Risk Score
1.79
Gender Split
67% female / 33% male

Top Prescribed Drugs (Medicare Part D)

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

What JEANINE PHAN, D.O. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Atorvastatin Calcium
572
Amlodipine Besylate
415
Losartan Potassium
362
Levothyroxine Sodium
331
Sertraline Hcl
321
Lisinopril
311
Donepezil Hcl
291
Memantine Hcl
266
Furosemide
246
Trazodone Hcl
224

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

Geriatric Medicine (Family Medicine) Physician Overview

How JEANINE PHAN, D.O. fits within the Geriatric Medicine (Family Medicine) Physician landscape nationally.

1,779
Geriatric Medicine (Family Medicine) Physician Providers in US
52
States with Geriatric Medicine (Family Medicine) Physician
4,854
Avg Claims per Provider

JEANINE PHAN, D.O.'s 10,097 claims are above the specialty average of 4,854.

Nearby Geriatric Medicine (Family Medicine) Physician Providers in California

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

Compare Geriatric Medicine (Family Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is JEANINE PHAN, D.O.'s specialty?
JEANINE PHAN, D.O. specializes in Geriatric Medicine (Family Medicine) Physician and practices in SAN JOSE, California. Credentials: D.O..
How much does JEANINE PHAN, D.O. prescribe under Medicare Part D?
In 2023, JEANINE PHAN, D.O. wrote 10,097 Medicare Part D claims totaling $546K in drug costs for 830 beneficiaries.
Where is JEANINE PHAN, D.O. located?
JEANINE PHAN, D.O. is located at 275 HOSPITAL PKWY, SAN JOSE, CA, 95119. Phone: (408) 972-3000.
What is JEANINE PHAN, D.O.'s NPI number?
JEANINE PHAN, D.O.'s National Provider Identifier (NPI) is 1083994487, issued on 08/17/2011.
Does JEANINE PHAN, D.O. prescribe more brand-name or generic drugs?
JEANINE PHAN, D.O.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $343K in brand drug costs.
Does JEANINE PHAN, D.O. prescribe opioids?
Yes, JEANINE PHAN, D.O. had 283 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many Geriatric Medicine (Family Medicine) Physician providers are there in the US?
There are 1,779 Geriatric Medicine (Family Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Family Medicine) Physician provider writes 4,854 Medicare Part D claims per year.
What drugs does JEANINE PHAN, D.O. prescribe most often?
Based on 2023 Medicare Part D data, JEANINE PHAN, D.O.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JEANINE PHAN, D.O. accept Medicare?
JEANINE PHAN, D.O. appears in CMS Medicare data with 10,097 Part D claims and 830 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JEANINE PHAN, D.O.'s credentials?
JEANINE PHAN, D.O.'s NPI is 1083994487 with credentials D.O.. 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