2026 NPPES data Physician Assistant NPI 1538539135 PA-C
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NATHANIEL CHANG, PA-C

Physician Assistant in SEATTLE, Washington. 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
395
Medicare Part D claims · 117 beneficiaries · Physician Assistant avg: 790
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$18.98
1 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

NATHANIEL CHANG, PA-C filed 395 Medicare Part D claims in 2023 as a Physician Assistant in SEATTLE, Washington, prescribing 93% generic.

395
Part D claims, 2023
93%
generic prescribing
$18.98
industry payments (Sunshine Act)

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.

NATHANIEL CHANG, PA-C's Medicare Part D volume vs every U.S. prescriber

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

395 Top 43% higher than 57% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 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

What does the federal data show about NATHANIEL CHANG, PA-C?

Quality data not reported

NPI registry status

Active

Issued 09/25/2015

NPI 1538539135

Primary specialty

Physician Assistant

High-volume

149,975 US NPIs in this specialty

Medicare Part D claims

395 50% vs specialty avg

2023 prescription claims

Specialty avg: 790

Specialty distribution in Washington

How Physician Assistant compares to other specialties among Washington providers

Washington providers

Physician Assistant share within Washington

1. Physician Assistant42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Physician Assistant share within Washington

Specialty board-certification context

Estimated specialty board-certified rate — Physician Assistant (ABMS / AOA reference)

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

Est. board-certified rate (Physician Assistant) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Physician Assistant) — 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).

NATHANIEL CHANG, PA-C appears in the CMS NPPES registry as a Physician Assistant provider holding PA-C credentials at 1959 NE PACIFIC ST, SEATTLE, WA, 98195, with a listed phone of (206) 520-5700. NPI 1538539135 was issued on 09/25/2015. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CHANG 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 395 prescription claims written by this provider, covering 117 Medicare beneficiaries and totaling roughly $23K in drug spend, split 7% brand-name and 93% generic by claim count, with an opioid prescribing rate of 3.3%. 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.

Physician Assistant is a high-volume specialty nationwide, with 149,975 enrolled providers across 56 states and an average of 790 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

1959 NE PACIFIC ST
SEATTLE, WA 98195

Provider Details

NPI 1538539135
Specialty Physician Assistant
Credentials PA-C
Gender Male
NPI Issued 09/25/2015

Hospital and facility affiliations

Facilities where NATHANIEL CHANG, PA-C 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.

THE ASSOCIATION OF UNIVERSITY PHYSICIANS
KENT, WA

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

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 NATHANIEL CHANG, PA-C. Source: openpaymentsdata.cms.gov.

Total received

$19

Largest payer

Ferring Pharmaceuticals 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 — Washington WMC 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 ~34K Washington medical licensees in 2023 — they are NOT specific to NATHANIEL CHANG, PA-C. To verify NATHANIEL CHANG, PA-C's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases

WMC 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 Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Generic-heavy

NATHANIEL CHANG, PA-C — brand share 7.0%
Specialty average (est.)

7% brand-name claims vs 93% generic, on 395 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.

395
Total Claims
$23K
Total Drug Cost
117
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
723
Total Day Supply
19,541
Brand vs Generic
7% brand / 93% generic
Brand Drug Cost
$14K
Generic Drug Cost
$8K
Opioid Claims
13 (3.3% rate)
Antibiotic Claims
22

Patient Demographics

Average Patient Age
70.5 years
Avg HCC Risk Score
0.96
Gender Split
59% female / 41% male

Top Prescribed Drugs (Medicare Part D)

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

What NATHANIEL CHANG, PA-C 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
Trazodone Hcl
23
Amlodipine Besylate
20
Paxlovid (Eua)
Nirmatrelvir/Ritonavir
15
Lisinopril
14
Atorvastatin Calcium
12
Bupropion Xl
Bupropion Hcl
12
Fluoxetine Hcl
11
Hydrochlorothiazide
11
Losartan Potassium
11
Rosuvastatin Calcium
11

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

Physician Assistant Overview

How NATHANIEL CHANG, PA-C fits within the Physician Assistant landscape nationally.

149,975
Physician Assistant Providers in US
56
States with Physician Assistant
790
Avg Claims per Provider

NATHANIEL CHANG, PA-C's 395 claims are below the specialty average of 790.

Nearby Physician Assistant Providers in Washington

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

Compare Physician Assistant nationally: see state-by-state distribution →

Frequently Asked Questions

What is NATHANIEL CHANG, PA-C's specialty?
NATHANIEL CHANG, PA-C specializes in Physician Assistant and practices in SEATTLE, Washington. Credentials: PA-C.
How much does NATHANIEL CHANG, PA-C prescribe under Medicare Part D?
In 2023, NATHANIEL CHANG, PA-C wrote 395 Medicare Part D claims totaling $23K in drug costs for 117 beneficiaries.
Where is NATHANIEL CHANG, PA-C located?
NATHANIEL CHANG, PA-C is located at 1959 NE PACIFIC ST, SEATTLE, WA, 98195. Phone: (206) 520-5700.
What is NATHANIEL CHANG, PA-C's NPI number?
NATHANIEL CHANG, PA-C's National Provider Identifier (NPI) is 1538539135, issued on 09/25/2015.
Does NATHANIEL CHANG, PA-C prescribe more brand-name or generic drugs?
NATHANIEL CHANG, PA-C's prescribing is 7% brand-name and 93% generic drugs by claim count, with $14K in brand drug costs.
Does NATHANIEL CHANG, PA-C prescribe opioids?
Yes, NATHANIEL CHANG, PA-C had 13 opioid claims in 2023 with an opioid prescribing rate of 3.3%.
How many Physician Assistant providers are there in the US?
There are 149,975 Physician Assistant providers across 56 states in the US. The average Physician Assistant provider writes 790 Medicare Part D claims per year.
What drugs does NATHANIEL CHANG, PA-C prescribe most often?
Based on 2023 Medicare Part D data, NATHANIEL CHANG, PA-C's most frequently prescribed drugs include Trazodone Hcl, Amlodipine Besylate, Paxlovid (Eua). This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does NATHANIEL CHANG, PA-C accept Medicare?
NATHANIEL CHANG, PA-C appears in CMS Medicare data with 395 Part D claims and 117 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify NATHANIEL CHANG, PA-C's credentials?
NATHANIEL CHANG, PA-C's NPI is 1538539135 with credentials PA-C. 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