NPI registry status
Active
2026 NPPES data Physician Assistant NPI 1508424805
Verify on CMS → Grace Chang
Physician Assistant in San Francisco, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 156,084 in Physician Assistant, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
478
Medicare Part D claims · 181 beneficiaries · Physician Assistant avg: 832
Generic prescribing
67%
generic claims · 33% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Grace Chang filed 478 Medicare Part D claims in 2024 as a Physician Assistant in San Francisco, California, prescribing 67% generic.
- 478
- Part D claims, 2024
- 67%
- generic prescribing
- ≥61st
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Grace Chang
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1508424805), first enumerated 05/31/2019.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 478 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Grace Chang's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1508424805 · Physician Assistant
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1508424805
- ENUM-RECENT 2019
- TAX-MEGA 156K Physician Assistant
- RX-LIGHT 478
- BOOK-MID 13,861 in California
- PHOTO-ENUM Christopher Clark, P… · 2019
Grace Chang's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
478 ≥ 61st percentile 61% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Grace Chang?
Quality data not reportedPrimary specialty
Physician Assistant
Medicare Part D claims
478 43% vs specialty avg
Specialty distribution in California
How Physician Assistant compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Physician Assistant. Verify directly:
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1508424805 |
|---|---|
| Specialty | Physician Assistant |
| Gender | Female |
| NPI Issued | 05/31/2019 |
Hospital and facility affiliations
Facilities where Grace Chang 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.
Sutter Bay Medical Foundation
Santa Rosa, 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 Grace Chang. To verify Grace Chang'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
Grace Chang - brand share 33.0%
Physician Assistant average
33% brand-name claims vs 67% generic, on 478 2024 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 2024.
478
Total Claims
$213K
Total Drug Cost
181
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,051.033
- Total Day Supply
- 31,086
- Brand vs Generic
- 33% brand / 67% generic
- Brand Drug Cost
- $201K
- Generic Drug Cost
- $12K
Patient Demographics
- Average Patient Age
- 75.7 years
- Avg HCC Risk Score
- 1.32
- Gender Split
- 45% female / 55% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Grace Chang prescribes most
Top Medicare Part D drugs by claim count, 2024
- Eliquis
Eliquis
108 claims
- Metoprolol Succinate
Metoprolol Succinate
61 claims
- Pantoprazole Sodium
Pantoprazole Sodium
50 claims
- Xarelto 36
Xarelto
36 claims
- Dofetilide 25
Dofetilide
25 claims
- Flecainide Acetate 25
Flecainide Acetate
25 claims
- Sotalol 18
Sotalol
18 claims
- Metoprolol Tartrate 16
Metoprolol Tartrate
16 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 108 |
| Metoprolol Succinate | 61 |
| Pantoprazole Sodium | 50 |
| Xarelto Rivaroxaban | 36 |
| Dofetilide | 25 |
| Flecainide Acetate | 25 |
| Sotalol Sotalol Hcl | 18 |
| Metoprolol Tartrate | 16 |
| Carvedilol | 13 |
| Amiodarone Hcl | 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 Grace Chang fits within the Physician Assistant landscape nationally.
156,084
Physician Assistant Providers in US
56
States with Physician Assistant
832
Avg Claims per Provider
Grace Chang's 478 claims are below the specialty average of 832.
Nationwide Physician Assistant peers with similar MIPS or enrollment year
Two federal-record peer sets for Chang, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2019)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chang.
One of 13,861 Physician Assistant providers enrolled in California, 5 are shown here.
Marcia -Galbraith
PA
Stockton, CA
Danny Abad
PA
Orange, CA
Lea Dominique Abadies
PA
Tustin, CA
Rea Elizabeth Abaniel
P.A.-C
Seal Beach, CA
Ramina Abbasi
PA-C
Signal Hill, CA
Compare Physician Assistant nationally: see state-by-state distribution →
Frequently Asked Questions
What is Grace Chang's specialty? ▼
Grace Chang specializes in Physician Assistant and practices in San Francisco, California.
How much does Grace Chang prescribe under Medicare Part D? ▼
In 2024, Grace Chang wrote 478 Medicare Part D claims totaling $213K in drug costs for 181 beneficiaries.
Where is Grace Chang located? ▼
Grace Chang is located at 2100 WEBSTER ST STE 516, San Francisco, CA, 94115. Phone: (415) 600-2402.
What is Grace Chang's NPI number? ▼
Grace Chang's National Provider Identifier (NPI) is 1508424805, issued on 05/31/2019.
Does Grace Chang prescribe more brand-name or generic drugs? ▼
Grace Chang's prescribing is 33% brand-name and 67% generic drugs by claim count, with $201K in brand drug costs.
How many Physician Assistant providers are there in the US? ▼
There are 156,084 Physician Assistant providers across 56 states in the US. The average Physician Assistant provider writes 832 Medicare Part D claims per year.
What drugs does Grace Chang prescribe most often? ▼
Based on 2024 Medicare Part D data, Grace Chang's most frequently prescribed drugs include Eliquis, Metoprolol Succinate, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Grace Chang accept Medicare? ▼
Grace Chang appears in CMS Medicare data with 478 Part D claims and 181 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Grace Chang's credentials? ▼
Grace Chang's NPI is 1508424805. 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
View source datasets and methodology notes
- 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 (2024). 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 August 2026 (NPPES) / 2024 (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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.