2026 NPPES data Obstetrics & Gynecology Physician NPI 1528029345 M.D.
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ALVIN NAKAMURA, M.D.

Obstetrics & Gynecology Physician in PORTLAND, Oregon. 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
170
Medicare Part D claims · 48 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

ALVIN NAKAMURA, M.D. filed 170 Medicare Part D claims in 2023 as a Obstetrics & Gynecology Physician in PORTLAND, Oregon, prescribing 91% generic.

170
Part D claims, 2023
91%
generic prescribing

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.

ALVIN NAKAMURA, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

170 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. 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-eligible specialty (heuristic — not verified)

ALVIN NAKAMURA, M.D. 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).

What does the federal data show about ALVIN NAKAMURA, M.D.?

Quality data not reported

NPI registry status

Active

Issued 03/31/2006

NPI 1528029345

Primary specialty

Obstetrics & Gynecology Physician

Mid-sized

44,313 US NPIs in this specialty

Medicare Part D claims

170 5% vs specialty avg

2023 prescription claims

Specialty avg: 179

Specialty distribution in Oregon

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

Oregon providers

Obstetrics & Gynecology Physician share within Oregon

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

Specialty board-certification context

Estimated specialty board-certified rate — Obstetrics & Gynecology Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Obstetrics & Gynecology Physician ABMS/AOA estimate

Est. board-certified rate (Obstetrics & Gynecology Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Obstetrics & Gynecology 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).

ALVIN NAKAMURA, M.D. appears in the CMS NPPES registry as a Obstetrics & Gynecology Physician provider holding M.D. credentials at 10000 SE MAIN ST, PORTLAND, OR, 97216, with a listed phone of (503) 257-7757. NPI 1528029345 was issued on 03/31/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what NAKAMURA 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 170 prescription claims written by this provider, covering 48 Medicare beneficiaries and totaling roughly $14K in drug spend, split 9% brand-name and 91% 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.

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

10000 SE MAIN ST
PORTLAND, OR 97216

Provider Details

NPI 1528029345
Specialty Obstetrics & Gynecology Physician
Credentials M.D.
Gender Male
NPI Issued 03/31/2006

Brand vs generic prescribing mix · Generic-heavy

ALVIN NAKAMURA, M.D. — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 170 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.

170
Total Claims
$14K
Total Drug Cost
48
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
362
Total Day Supply
10,150
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$6K
Generic Drug Cost
$8K

Patient Demographics

Average Patient Age
68.8 years
Avg HCC Risk Score
0.77

Top Prescribed Drugs (Medicare Part D)

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

What ALVIN NAKAMURA, M.D. 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
Estradiol
68
Larin
Norethindrone Ac-Eth Estradiol
15
Dotti
Estradiol
14

* 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 ALVIN NAKAMURA, M.D. 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

ALVIN NAKAMURA, M.D.'s 170 claims are below the specialty average of 179.

Nearby Obstetrics & Gynecology Physician Providers in Oregon

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

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

Frequently Asked Questions

What is ALVIN NAKAMURA, M.D.'s specialty?
ALVIN NAKAMURA, M.D. specializes in Obstetrics & Gynecology Physician and practices in PORTLAND, Oregon. Credentials: M.D..
How much does ALVIN NAKAMURA, M.D. prescribe under Medicare Part D?
In 2023, ALVIN NAKAMURA, M.D. wrote 170 Medicare Part D claims totaling $14K in drug costs for 48 beneficiaries.
Where is ALVIN NAKAMURA, M.D. located?
ALVIN NAKAMURA, M.D. is located at 10000 SE MAIN ST, PORTLAND, OR, 97216. Phone: (503) 257-7757.
What is ALVIN NAKAMURA, M.D.'s NPI number?
ALVIN NAKAMURA, M.D.'s National Provider Identifier (NPI) is 1528029345, issued on 03/31/2006.
Does ALVIN NAKAMURA, M.D. prescribe more brand-name or generic drugs?
ALVIN NAKAMURA, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $6K 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 ALVIN NAKAMURA, M.D. prescribe most often?
Based on 2023 Medicare Part D data, ALVIN NAKAMURA, M.D.'s most frequently prescribed drugs include Estradiol, Larin, Dotti. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ALVIN NAKAMURA, M.D. accept Medicare?
ALVIN NAKAMURA, M.D. appears in CMS Medicare data with 170 Part D claims and 48 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ALVIN NAKAMURA, M.D.'s credentials?
ALVIN NAKAMURA, M.D.'s NPI is 1528029345 with credentials M.D.. 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