NPI registry status
Active
2026 NPPES data Physician Assistant NPI 1912989591 PA
Verify on CMS → Pei-Jing Ma, PA
Physician Assistant in Fullerton, 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 150,974 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
424
Medicare Part D claims · 221 beneficiaries · Physician Assistant avg: 790
What the federal data shows
Pei-Jing Ma, PA filed 424 Medicare Part D claims in 2023 as a Physician Assistant in Fullerton, California.
- 424
- Part D claims, 2023
- ≥62nd
- 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.
Pei-Jing Ma, PA's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
424 ≥ 62nd percentile 62% of 1,370,886 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 · 2023
What does the federal data show about Pei-Jing Ma, PA?
Quality data not reportedPrimary specialty
Physician Assistant
Medicare Part D claims
424 46% 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).
Pei-Jing Ma, PA appears in the CMS NPPES registry as a Physician Assistant provider holding PA credentials at 101 E VALENCIA MESA DR, Fullerton, CA, 92835, with a listed phone of (714) 992-3965. NPI 1912989591 was issued on 11/18/2005.
Medicare Part D records for calendar year 2023 show 424 prescription claims written by this provider, covering 221 Medicare beneficiaries and totaling roughly $6K in drug spend, with an opioid prescribing rate of 13.0%.
Physician Assistant is a high-volume specialty nationwide, with 150,974 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
Provider Details
| NPI | 1912989591 |
|---|---|
| Specialty | Physician Assistant |
| Credentials | PA |
| Gender | Female |
| NPI Issued | 11/18/2005 |
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 Pei-Jing Ma, PA. To verify Pei-Jing Ma, PA'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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
424
Total Claims
$6K
Total Drug Cost
221
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 447
- Total Day Supply
- 4,859
- Generic Drug Cost
- $3K
- Opioid Claims
- 55 (13.0% rate)
- Antibiotic Claims
- 116
Patient Demographics
- Average Patient Age
- 70.8 years
- Avg HCC Risk Score
- 1.76
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 37, 65-74: 108, 75-84: 54, 85+: 22
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Pei-Jing Ma, PA prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Odt
Ondansetron Odt
52 claims
- Ibuprofen
Ibuprofen
41 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
36 claims
- Cephalexin
Cephalexin
31 claims
- Azithromycin
Azithromycin
22 claims
- Cefdinir 20
Cefdinir
20 claims
- Prednisone 17
Prednisone
17 claims
- Sulfamethoxazole-T… 15
Sulfamethoxazole-Trimethoprim
15 claims
| Drug | Claims |
|---|---|
| Ondansetron Odt Ondansetron | 52 |
| Ibuprofen | 41 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 36 |
| Cephalexin | 31 |
| Azithromycin | 22 |
| Cefdinir | 20 |
| Prednisone | 17 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 15 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 12 |
| Tramadol Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Physician Assistant Overview
How Pei-Jing Ma, PA fits within the Physician Assistant landscape nationally.
150,974
Physician Assistant Providers in US
56
States with Physician Assistant
790
Avg Claims per Provider
Pei-Jing Ma, PA's 424 claims are below the specialty average of 790.
Nearby Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Ma.
Dr. Marcia -Galbraith
PA
Stockton, CA
Dr. Danny Abad
PA
Orange, CA
Dr. Lea Dominique Abadies
PA
Tustin, CA
Dr. Rea Elizabeth Abaniel
P.A.-C
Seal Beach, CA
Dr. Ramina Abbasi
PA-C
Signal Hill, CA
Compare Physician Assistant nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Physician Assistant peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Pei-Jing Ma, PA's specialty? ▼
Pei-Jing Ma, PA specializes in Physician Assistant and practices in Fullerton, California. Credentials: PA.
How much does Pei-Jing Ma, PA prescribe under Medicare Part D? ▼
In 2023, Pei-Jing Ma, PA wrote 424 Medicare Part D claims totaling $6K in drug costs for 221 beneficiaries.
Where is Pei-Jing Ma, PA located? ▼
Pei-Jing Ma, PA is located at 101 E VALENCIA MESA DR, Fullerton, CA, 92835. Phone: (714) 992-3965.
What is Pei-Jing Ma, PA's NPI number? ▼
Pei-Jing Ma, PA's National Provider Identifier (NPI) is 1912989591, issued on 11/18/2005.
Does Pei-Jing Ma, PA prescribe opioids? ▼
Yes, Pei-Jing Ma, PA had 55 opioid claims in 2023 with an opioid prescribing rate of 13.0%.
How many Physician Assistant providers are there in the US? ▼
There are 150,974 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 Pei-Jing Ma, PA prescribe most often? ▼
Based on 2023 Medicare Part D data, Pei-Jing Ma, PA's most frequently prescribed drugs include Ondansetron Odt, Ibuprofen, Hydrocodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Pei-Jing Ma, PA accept Medicare? ▼
Pei-Jing Ma, PA appears in CMS Medicare data with 424 Part D claims and 221 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Pei-Jing Ma, PA's credentials? ▼
Pei-Jing Ma, PA's NPI is 1912989591 with credentials PA. 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 (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
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 May 2026.