NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1568469203 PA
Verify on CMS → Stephen Greenfield, PA
Medical Physician Assistant in San Antonio, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40,527 in Medical 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
260
Medicare Part D claims · 179 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
85%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Stephen Greenfield, PA filed 260 Medicare Part D claims in 2023 as a Medical Physician Assistant in San Antonio, Texas, prescribing 85% generic.
- 260
- Part D claims, 2023
- 85%
- 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.
Stephen Greenfield, PA's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
260 49th percentile higher than 49% 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 Stephen Greenfield, PA?
Quality data not reportedPrimary specialty
Medical Physician Assistant
Medicare Part D claims
260 76% vs specialty avg
Specialty distribution in Texas
How Medical Physician Assistant compares to other specialties among Texas 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 Medical 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).
Stephen Greenfield, PA appears in the CMS NPPES registry as a Medical Physician Assistant provider holding PA credentials at 430 W SUNSET RD STE 201, San Antonio, TX, 78209, with a listed phone of (210) 824-4584. NPI 1568469203 was issued on 07/07/2005.
Medicare Part D records for calendar year 2023 show 260 prescription claims written by this provider, covering 179 Medicare beneficiaries and totaling roughly $32K in drug spend, split 9% brand-name and 85% generic by claim count.
Medical Physician Assistant is a mid-sized specialty nationwide, with 40,527 enrolled providers across 55 states and an average of 1,077 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 | 1568469203 |
|---|---|
| Specialty | Medical Physician Assistant |
| Credentials | PA |
| Gender | Male |
| NPI Issued | 07/07/2005 |
License & disciplinary context - Texas TMB 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 ~77K Texas medical licensees in 2023 - they are NOT specific to Stephen Greenfield, PA. To verify Stephen Greenfield, PA's current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB 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 Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
Stephen Greenfield, PA - brand share 9.0%
Medical Physician Assistant average
9% brand-name claims vs 85% generic, on 260 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.
260
Total Claims
$32K
Total Drug Cost
179
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 594
- Total Day Supply
- 15,704
- Brand vs Generic
- 9% brand / 85% generic
- Brand Drug Cost
- $28K
- Generic Drug Cost
- $3K
- Antibiotic Claims
- 43
Patient Demographics
- Average Patient Age
- 72.5 years
- Avg HCC Risk Score
- 1.97
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 28, 65-74: 76, 75-84: 48, 85+: 27
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Stephen Greenfield, PA prescribes most
Top Medicare Part D drugs by claim count, 2023
- Lisinopril
Lisinopril
18 claims
- Levothyroxine Sodium
Levothyroxine Sodium
15 claims
- Metoprolol Succinate
Metoprolol Succinate
12 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
11 claims
- Atorvastatin Calcium
Atorvastatin Calcium
11 claims
- Paxlovid (Eua)
Paxlovid (Eua)
11 claims
| Drug | Claims |
|---|---|
| Lisinopril | 18 |
| Levothyroxine Sodium | 15 |
| Metoprolol Succinate | 12 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 11 |
| Atorvastatin Calcium | 11 |
| Paxlovid (Eua) Nirmatrelvir/Ritonavir | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Stephen Greenfield, PA fits within the Medical Physician Assistant landscape nationally.
40,527
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider
Stephen Greenfield, PA's 260 claims are below the specialty average of 1,077.
Nearby Medical Physician Assistant Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Greenfield.
Sofia Abdulaziz
Dallas, TX
Dr. Julia Abell
PA
New Braunfels, TX
Dr. Latoya Abernathy
PA-C
Pearland, TX
Dr. Ayat Aborahma
PA-C
Plano, TX
Dr. Michael Abrego
PA-C
Texas City, TX
Compare Medical 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 Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Medical 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 Stephen Greenfield, PA's specialty? ▼
Stephen Greenfield, PA specializes in Medical Physician Assistant and practices in San Antonio, Texas. Credentials: PA.
How much does Stephen Greenfield, PA prescribe under Medicare Part D? ▼
In 2023, Stephen Greenfield, PA wrote 260 Medicare Part D claims totaling $32K in drug costs for 179 beneficiaries.
Where is Stephen Greenfield, PA located? ▼
Stephen Greenfield, PA is located at 430 W SUNSET RD STE 201, San Antonio, TX, 78209. Phone: (210) 824-4584.
What is Stephen Greenfield, PA's NPI number? ▼
Stephen Greenfield, PA's National Provider Identifier (NPI) is 1568469203, issued on 07/07/2005.
Does Stephen Greenfield, PA prescribe more brand-name or generic drugs? ▼
Stephen Greenfield, PA's prescribing is 9% brand-name and 85% generic drugs by claim count, with $28K in brand drug costs.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,527 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does Stephen Greenfield, PA prescribe most often? ▼
Based on 2023 Medicare Part D data, Stephen Greenfield, PA's most frequently prescribed drugs include Lisinopril, Levothyroxine Sodium, Metoprolol Succinate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Stephen Greenfield, PA accept Medicare? ▼
Stephen Greenfield, PA appears in CMS Medicare data with 260 Part D claims and 179 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Stephen Greenfield, PA's credentials? ▼
Stephen Greenfield, PA's NPI is 1568469203 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.