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2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1366731960 M.D.
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Joseph Diehl, M.D.

Student in an Organized Health Care Education/Training Program in Sn Luis Obisp, 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 331,274 in Student in an Organized Health Care Education/Training Program, 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
1K
Medicare Part D claims · 706 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
Generic prescribing
98%
generic claims · 2% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75.2/100
▼ 8 pts below national avg 83.5 · Above neutral
Industry payments
$735.98
10 payments · CMS Open Payments (Sunshine Act)
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Joseph Diehl, M.D. reported a CMS MIPS final score of 75.2/100 - below the 83.5 national average - and filed 1,281 Medicare Part D claims in 2023.

75.2/100
MIPS score · -8 vs avg
1K
Part D claims, 2023
98%
generic prescribing
$735.98
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.

CMS NPPES provider registry desk

NPI 1366731960 · Student in an Organized Health Care Education/Training Program

NPI-10 · ENUM-MID · TAX-MEGA · MIPS-BELOW · RX-MID · BOOK-MID · PHOTO-FINISH

  • NPI-10 1366731960
  • ENUM-MID 2011
  • TAX-MEGA 331K Student in
  • MIPS-BELOW 75.2/100
  • RX-MID 1,281
  • BOOK-MID 46,496 in California
  • PHOTO-FINISH Sanjai Jalaj · ±0.0

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Joseph Diehl, M.D.'s MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

75 ≥ 15th percentile 15% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). This entry sits in this band. 80–90: 129,887 measured providers (29%). Above this entry. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where Joseph Diehl, M.D. sits

This provider among student in an organized health care education/training program peers

Across the 12,177 student in an organized health care education/training program providers who report both Medicare Part D prescribing and a MIPS quality score, Joseph Diehl, M.D. writes more Part D claims than 83% of them and scores higher on MIPS quality than 12% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 75Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 77Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 17Joseph Diehl, M.D., Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 12
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one student in an organized health care education/training program peer from a representative sample of 60; the gold marker is Joseph Diehl, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

What does the federal data show about Joseph Diehl, M.D.?

Below national average

NPI registry status

Active

Issued 04/04/2011

NPI 1366731960

Primary specialty

Student in an Organized Health Care Education/Training Program

High-volume

331,274 US NPIs in this specialty

Medicare Part D claims

1,281 179% vs specialty avg

2023 prescription claims

Specialty avg: 459

MIPS final score

75.2/100 8.3 pts vs avg

Above neutral band

vs 83.5 national avg

Specialty distribution in California

How Student in an Organized Health Care Education/Training Program compares to other specialties among California providers

California providers
Behavior Technician17.3%Marriage & Family Therapist5.5%Student in an Organized Heal…5%Mental Health Counselor3.9%Pharmacist3.5%Clinical Social Worker3.1%
Largest specialties in California (% of in-state providers)

Medicare quality performance, MIPS

Joseph Diehl, M.D.'s 2023 MIPS final score plotted against the Student in an Organized Health Care Education/Training Program national average

Below national average
MIPS Final Score
75.2/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%75.2%
MIPS final score (Student in an Organized Health Care Education/Training Program) - 75.2/100 vs national avg 83.5
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

15 SANTA ROSA ST
Sn Luis Obisp, CA 93405
(805) 541-2650

Provider Details

NPI 1366731960
Specialty Student in an Organized Health Care Education/Training Program
Credentials M.D.
Gender Male
NPI Issued 04/04/2011

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

75.2446
Final Score
Measured-score avg: 83.5
98.602
Quality
19.346
Cost

Reporting: Individual

Hospital and facility affiliations

Facilities where Joseph Diehl, M.D. 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.

San Luis Dermatology, Inc.
San Luis Obispo, 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).

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 Joseph Diehl, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$736

Largest payer

Organogenesis 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 Joseph Diehl, M.D.. To verify Joseph Diehl, M.D.'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 · Generic-heavy

Joseph Diehl, M.D. - brand share 2.0%
Student in an Organized Health Care Education/Training Program average

2% brand-name claims vs 98% generic, on 1,281 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.

1,281
Total Claims
$65K
Total Drug Cost
706
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,513
Total Day Supply
38,831
Brand vs Generic
2% brand / 98% generic
Brand Drug Cost
$25K
Generic Drug Cost
$40K
Antibiotic Claims
74

Patient Demographics

Average Patient Age
76.3 years
Avg HCC Risk Score
0.87
Gender Split
52% female / 48% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What Joseph Diehl, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Gentamicin Sulfate
 148
Fluorouracil
 146
Betamethasone Diprop Augmented
Betamethasone/Propylene Glyc
141
Ketoconazole
 117
Triamcinolone Acetonide
 99
Valacyclovir
Valacyclovir Hcl
62
Nystatin
 48
Minoxidil
 46
Clobetasol Propionate
 42
Ciclopirox
 41

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

More Student in an Organized Health Care Education/Training Program in CA → All providers in California → Compare specialties →

Student in an Organized Health Care Education/Training Program Overview

How Joseph Diehl, M.D. fits within the Student in an Organized Health Care Education/Training Program landscape nationally.

331,274
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
459
Avg Claims per Provider

Joseph Diehl, M.D.'s 1,281 claims are above the specialty average of 459.

Nationwide Student in an Organized Health Care Education/Training Program peers with similar MIPS or enrollment year

Two federal-record peer sets for Diehl, both outside California so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (75.2 here).

Valerie Ayoub 75.3 MI Hussein Issa 75.3 MI Anthony Khalifeh 75.3 MA Sanjai Jalaj 75.2 NJ

Same NPPES enumeration year (2011)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Santosha Vardhana New York, NY Bonnie Vallie Cleveland, OH Anna Goroncy Cincinnati, OH Gina Mathew Mesa, AZ

Nearby Student in an Organized Health Care Education/Training Program Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Diehl.

One of 46,496 Student in an Organized Health Care Education/Training Program providers enrolled in California, 5 are shown here.

Dr. Alexander Aabedi
MD
San Francisco, CA
Andre Aabedi
Pomona, CA
Dr. Natalie Aabodi
DMD
Pomona, CA
Dr. Mati Aamed
PSY.D.
Pacoima, CA
Dr. Kjeld Aamodt
DDS, MS
San Francisco, CA

Compare Student in an Organized Health Care Education/Training Program nationally: see state-by-state distribution →

Frequently Asked Questions

What is Joseph Diehl, M.D.'s specialty? ▼
Joseph Diehl, M.D. specializes in Student in an Organized Health Care Education/Training Program and practices in Sn Luis Obisp, California. Credentials: M.D..
How much does Joseph Diehl, M.D. prescribe under Medicare Part D? ▼
In 2023, Joseph Diehl, M.D. wrote 1,281 Medicare Part D claims totaling $65K in drug costs for 706 beneficiaries.
What is Joseph Diehl, M.D.'s Medicare quality score? ▼
Joseph Diehl, M.D. has a CMS MIPS Final Score of 75.2/100 (Quality: 98.6, Cost: 19.3). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Joseph Diehl, M.D. located? ▼
Joseph Diehl, M.D. is located at 15 SANTA ROSA ST, Sn Luis Obisp, CA, 93405. Phone: (805) 541-2650.
What is Joseph Diehl, M.D.'s NPI number? ▼
Joseph Diehl, M.D.'s National Provider Identifier (NPI) is 1366731960, issued on 04/04/2011.
Does Joseph Diehl, M.D. prescribe more brand-name or generic drugs? ▼
Joseph Diehl, M.D.'s prescribing is 2% brand-name and 98% generic drugs by claim count, with $25K in brand drug costs.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 331,274 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 459 Medicare Part D claims per year.
What drugs does Joseph Diehl, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Joseph Diehl, M.D.'s most frequently prescribed drugs include Gentamicin Sulfate, Fluorouracil, Betamethasone Diprop Augmented. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Joseph Diehl, M.D. accept Medicare? ▼
Joseph Diehl, M.D. appears in CMS Medicare data with 1,281 Part D claims and 706 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Joseph Diehl, M.D.'s credentials? ▼
Joseph Diehl, M.D.'s NPI is 1366731960 with credentials M.D.. 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.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
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 editorial process.

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.