NPI registry status
Active
2026 NPPES data Child & Adolescent Psychiatry Physician NPI 1407934557 MD
Verify on CMS → Rodney Erwin, MD
Child & Adolescent Psychiatry Physician in Walnut Creek, 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 6,164 in Child & Adolescent Psychiatry Physician, 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
607
Medicare Part D claims · 44 beneficiaries · Child & Adolescent Psychiatry Physician avg: 600
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Rodney Erwin, MD filed 607 Medicare Part D claims in 2023 as a Child & Adolescent Psychiatry Physician in Walnut Creek, California, prescribing 87% generic.
- 607
- Part D claims, 2023
- 87%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥69th
- 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 Rodney Erwin, MD
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 1407934557), first enumerated 11/02/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 607 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- 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 Rodney Erwin, MD'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 1407934557 · Child & Adolescent Psychiatry Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1407934557
- ENUM-LEGACY 2006
- TAX-MID 6K Child &
- RX-LIGHT 607
- BOOK-LIGHT 858 in California
- PHOTO-ENUM C. Shaffia Laue · 2006
Rodney Erwin, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
607 ≥ 69th percentile 69% 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
✓
Board certification likely (heuristic, not verified)
Rodney Erwin, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Rodney Erwin, MD?
Quality data not reportedPrimary specialty
Child & Adolescent Psychiatry Physician
Medicare Part D claims
607 1% vs specialty avg
Specialty distribution in California
How Child & Adolescent Psychiatry Physician 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 Child & Adolescent Psychiatry Physician. 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 | 1407934557 |
|---|---|
| Specialty | Child & Adolescent Psychiatry Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/02/2006 |
Hospital and facility affiliations
Facilities where Rodney Erwin, MD 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.
Permanente Medical Group Inc
Petaluma, 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 Rodney Erwin, MD. To verify Rodney Erwin, MD'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
Rodney Erwin, MD - brand share 13.0%
Child & Adolescent Psychiatry Physician average
13% brand-name claims vs 87% generic, on 607 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.
607
Total Claims
$67K
Total Drug Cost
44
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,087
- Total Day Supply
- 31,925
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $53K
- Generic Drug Cost
- $15K
Patient Demographics
- Average Patient Age
- 55.1 years
- Avg HCC Risk Score
- 0.89
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 23, 65-74: 16, 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 Rodney Erwin, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Gabapentin
Gabapentin
32 claims
- Bupropion Xl
Bupropion Xl
31 claims
- Duloxetine Hcl
Duloxetine Hcl
26 claims
- Diazepam
Diazepam
24 claims
- Clonazepam
Clonazepam
23 claims
- Sertraline Hcl
Sertraline Hcl
22 claims
- Lithium Carbonate Er
Lithium Carbonate Er
21 claims
- Trazodone Hcl
Trazodone Hcl
21 claims
| Drug | Claims |
|---|---|
| Gabapentin | 32 |
| Bupropion Xl Bupropion Hcl | 31 |
| Duloxetine Hcl | 26 |
| Diazepam | 24 |
| Clonazepam | 23 |
| Sertraline Hcl | 22 |
| Lithium Carbonate Er Lithium Carbonate | 21 |
| Trazodone Hcl | 21 |
| Quetiapine Fumarate | 20 |
| Buspirone Hcl | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Child & Adolescent Psychiatry Physician in CA →
All providers in California →
Compare specialties →
Child & Adolescent Psychiatry Physician Overview
How Rodney Erwin, MD fits within the Child & Adolescent Psychiatry Physician landscape nationally.
6,164
Child & Adolescent Psychiatry Physician Providers in US
54
States with Child & Adolescent Psychiatry Physician
600
Avg Claims per Provider
Rodney Erwin, MD's 607 claims are above the specialty average of 600.
Nationwide Child & Adolescent Psychiatry Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Erwin, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Child & Adolescent Psychiatry Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Erwin.
One of 858 Child & Adolescent Psychiatry Physician providers enrolled in California, 5 are shown here.
Dr. Manar Abdelmegeed
MD
San Jose, CA
Dr. Beverly Abramowitz
M.D.
Roseville, CA
Dr. Allan Abrams
M.D.
Simi Valley, CA
Dr. Ajjya Acharya
MD
Sacramento, CA
Dr. Lisa Acosta
MD
Simi Valley, CA
Compare Child & Adolescent Psychiatry Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Rodney Erwin, MD's specialty? ▼
Rodney Erwin, MD specializes in Child & Adolescent Psychiatry Physician and practices in Walnut Creek, California. Credentials: MD.
How much does Rodney Erwin, MD prescribe under Medicare Part D? ▼
In 2023, Rodney Erwin, MD wrote 607 Medicare Part D claims totaling $67K in drug costs for 44 beneficiaries.
Where is Rodney Erwin, MD located? ▼
Rodney Erwin, MD is located at 1425 S MAIN ST, Walnut Creek, CA, 94596. Phone: (925) 295-4000.
What is Rodney Erwin, MD's NPI number? ▼
Rodney Erwin, MD's National Provider Identifier (NPI) is 1407934557, issued on 11/02/2006.
Does Rodney Erwin, MD prescribe more brand-name or generic drugs? ▼
Rodney Erwin, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $53K in brand drug costs.
How many Child & Adolescent Psychiatry Physician providers are there in the US? ▼
There are 6,164 Child & Adolescent Psychiatry Physician providers across 54 states in the US. The average Child & Adolescent Psychiatry Physician provider writes 600 Medicare Part D claims per year.
What drugs does Rodney Erwin, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Rodney Erwin, MD's most frequently prescribed drugs include Gabapentin, Bupropion Xl, Duloxetine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rodney Erwin, MD accept Medicare? ▼
Rodney Erwin, MD appears in CMS Medicare data with 607 Part D claims and 44 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rodney Erwin, MD's credentials? ▼
Rodney Erwin, MD's NPI is 1407934557 with credentials MD. 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.