NPI registry status
Active
2026 NPPES data Physician Assistant NPI 1811901960 PA
Verify on CMS → Timothy So, PA
Physician Assistant in Long Beach, 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 149,975 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
7K
Medicare Part D claims · 542 beneficiaries · Physician Assistant avg: 790
Generic prescribing
82%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.7K
81 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Timothy So, PA filed 7,403 Medicare Part D claims in 2023 as a Physician Assistant in Long Beach, California, prescribing 82% generic.
- 7K
- Part D claims, 2023
- 82%
- generic prescribing
- $1.7K
- 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.
Timothy So, PA's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
7,403 Top 3% higher than 97% of 1,370,886 prescribers
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 Timothy So, PA?
Quality data not reportedPrimary specialty
Physician Assistant
Medicare Part D claims
7,403 9× 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).
Timothy So, PA appears in the CMS NPPES registry as a Physician Assistant provider holding PA credentials at 1627 E. ANAHEIM STREET, Long Beach, CA, 90813, with a listed phone of (562) 437-0373. NPI 1811901960 was issued on 07/27/2006.
Medicare Part D records for calendar year 2023 show 7,403 prescription claims written by this provider, covering 542 Medicare beneficiaries and totaling roughly $979K in drug spend, split 17% brand-name and 82% generic by claim count, with an opioid prescribing rate of 0.4%.
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
Provider Details
| NPI | 1811901960 |
|---|---|
| Specialty | Physician Assistant |
| Credentials | PA |
| Gender | Male |
| NPI Issued | 07/27/2006 |
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 Timothy So, PA. Source: openpaymentsdata.cms.gov.
Total received
$1.7K
Largest payer
Amgen 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 - 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 Timothy So, PA. To verify Timothy So, 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.
Brand vs generic prescribing mix · Typical
Timothy So, PA - brand share 17.0%
Physician Assistant average
17% brand-name claims vs 82% generic, on 7,403 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.
7,403
Total Claims
$979K
Total Drug Cost
542
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 12,921
- Total Day Supply
- 376,858
- Brand vs Generic
- 17% brand / 82% generic
- Brand Drug Cost
- $792K
- Generic Drug Cost
- $184K
- Opioid Claims
- 26 (0.4% rate)
- Antibiotic Claims
- 246
Patient Demographics
- Average Patient Age
- 68.4 years
- Avg HCC Risk Score
- 1.13
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 94, 65-74: 357, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Timothy So, PA prescribes most
Top Medicare Part D drugs by claim count, 2023
- Trazodone Hcl
Trazodone Hcl
477 claims
- Atorvastatin Calcium
Atorvastatin Calcium
384 claims
- Amlodipine Besylate
Amlodipine Besylate
266 claims
- Omeprazole
Omeprazole
230 claims
- Sertraline Hcl
Sertraline Hcl
216 claims
- Metformin Hcl 186
Metformin Hcl
186 claims
- Albuterol Sulfate … 167
Albuterol Sulfate Hfa
167 claims
- Rosuvastatin Calcium 142
Rosuvastatin Calcium
142 claims
| Drug | Claims |
|---|---|
| Trazodone Hcl | 477 |
| Atorvastatin Calcium | 384 |
| Amlodipine Besylate | 266 |
| Omeprazole | 230 |
| Sertraline Hcl | 216 |
| Metformin Hcl | 186 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 167 |
| Rosuvastatin Calcium | 142 |
| Gabapentin | 135 |
| Losartan-Hydrochlorothiazide Losartan/Hydrochlorothiazide | 128 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Physician Assistant Overview
How Timothy So, PA fits within the Physician Assistant landscape nationally.
149,975
Physician Assistant Providers in US
56
States with Physician Assistant
790
Avg Claims per Provider
Timothy So, PA's 7,403 claims are above 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 So.
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.
Healthcare Guides
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Frequently Asked Questions
What is Timothy So, PA's specialty? ▼
Timothy So, PA specializes in Physician Assistant and practices in Long Beach, California. Credentials: PA.
How much does Timothy So, PA prescribe under Medicare Part D? ▼
In 2023, Timothy So, PA wrote 7,403 Medicare Part D claims totaling $979K in drug costs for 542 beneficiaries.
Where is Timothy So, PA located? ▼
Timothy So, PA is located at 1627 E. ANAHEIM STREET, Long Beach, CA, 90813. Phone: (562) 437-0373.
What is Timothy So, PA's NPI number? ▼
Timothy So, PA's National Provider Identifier (NPI) is 1811901960, issued on 07/27/2006.
Does Timothy So, PA prescribe more brand-name or generic drugs? ▼
Timothy So, PA's prescribing is 17% brand-name and 82% generic drugs by claim count, with $792K in brand drug costs.
Does Timothy So, PA prescribe opioids? ▼
Yes, Timothy So, PA had 26 opioid claims in 2023 with an opioid prescribing rate of 0.4%.
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 Timothy So, PA prescribe most often? ▼
Based on 2023 Medicare Part D data, Timothy So, PA's most frequently prescribed drugs include Trazodone Hcl, Atorvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Timothy So, PA accept Medicare? ▼
Timothy So, PA appears in CMS Medicare data with 7,403 Part D claims and 542 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy So, PA's credentials? ▼
Timothy So, PA's NPI is 1811901960 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
Compiled from official public sources by the PlainDoctor editorial team.