NPI registry status
Active
2026 NPPES data Endocrinology, Diabetes & Metabolism Physician NPI 1114977840 PH.D., M.D.
Verify on CMS → Karen Herbst, PH.D., M.D.
Endocrinology, Diabetes & Metabolism Physician in Tucson, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 7,852 in Endocrinology, Diabetes & Metabolism 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
85
Medicare Part D claims · 18 beneficiaries · Endocrinology, Diabetes & Metabolism Physician avg: 3K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$36.1K
14 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
Karen Herbst, PH.D., M.D. filed 85 Medicare Part D claims in 2023 as a Endocrinology, Diabetes & Metabolism Physician in Tucson, Arizona, prescribing 81% generic.
- 85
- Part D claims, 2023
- 81%
- generic prescribing
- $36.1K
- 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.
Karen Herbst, PH.D., M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
85 0th percentile higher than 0% 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
◑
Board-eligible specialty (heuristic, not verified)
Karen Herbst, PH.D., M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Karen Herbst, PH.D., M.D.?
Quality data not reportedPrimary specialty
Endocrinology, Diabetes & Metabolism Physician
Medicare Part D claims
85 97% vs specialty avg
Specialty distribution in Arizona
How Endocrinology, Diabetes & Metabolism Physician compares to other specialties among Arizona 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 Endocrinology, Diabetes & Metabolism 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).
Karen Herbst, PH.D., M.D. appears in the CMS NPPES registry as a Endocrinology, Diabetes & Metabolism Physician provider holding PH.D., M.D. credentials at 6365 E TANQUE VERDE RD STE 200, Tucson, AZ, 85715, with a listed phone of (520) 719-1610. NPI 1114977840 was issued on 05/11/2006.
Medicare Part D records for calendar year 2023 show 85 prescription claims written by this provider, covering 18 Medicare beneficiaries and totaling roughly $27K in drug spend, split 19% brand-name and 81% generic by claim count.
Endocrinology, Diabetes & Metabolism Physician is a mid-sized specialty nationwide, with 7,852 enrolled providers across 54 states and an average of 2,639 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 | 1114977840 |
|---|---|
| Specialty | Endocrinology, Diabetes & Metabolism Physician |
| Credentials | PH.D., M.D. |
| Gender | Female |
| NPI Issued | 05/11/2006 |
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 Karen Herbst, PH.D., M.D.. Source: openpaymentsdata.cms.gov.
Total received
$36.1K
Largest payer
CashFlow Solutions, LLC
Most common payment type
Consulting Fee
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.
Brand vs generic prescribing mix · Typical
Karen Herbst, PH.D., M.D. - brand share 19.0%
Endocrinology, Diabetes & Metabolism Physician average
19% brand-name claims vs 81% generic, on 85 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.
85
Total Claims
$27K
Total Drug Cost
18
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 137
- Total Day Supply
- 4,050
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $24K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 67.2 years
- Avg HCC Risk Score
- 0.86
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karen Herbst, PH.D., M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Dextroamphetamine …
Dextroamphetamine Sulfate
24 claims
- Pentoxifylline
Pentoxifylline
14 claims
- Famotidine
Famotidine
11 claims
| Drug | Claims |
|---|---|
| Dextroamphetamine Sulfate | 24 |
| Pentoxifylline | 14 |
| Famotidine | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Endocrinology, Diabetes & Metabolism Physician in AZ →
All providers in Arizona →
Compare specialties →
Endocrinology, Diabetes & Metabolism Physician Overview
How Karen Herbst, PH.D., M.D. fits within the Endocrinology, Diabetes & Metabolism Physician landscape nationally.
7,852
Endocrinology, Diabetes & Metabolism Physician Providers in US
54
States with Endocrinology, Diabetes & Metabolism Physician
2,639
Avg Claims per Provider
Karen Herbst, PH.D., M.D.'s 85 claims are below the specialty average of 2,639.
Nearby Endocrinology, Diabetes & Metabolism Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Herbst.
Dr. Rashi Agarwal
M.D.
Peoria, AZ
Dr. Seema Ahluwalia
M.D.
Chandler, AZ
Dr. Adnan Ajmal
MD
Phoenix, AZ
Dr. Osamah Al Ali
MD
Scottsdale, AZ
Dr. Dalal Alromaihi
M.D.
Yuma, AZ
Compare Endocrinology, Diabetes & Metabolism Physician 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 Arizona medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Endocrinology, Diabetes & Metabolism Physician 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 Karen Herbst, PH.D., M.D.'s specialty? ▼
Karen Herbst, PH.D., M.D. specializes in Endocrinology, Diabetes & Metabolism Physician and practices in Tucson, Arizona. Credentials: PH.D., M.D..
How much does Karen Herbst, PH.D., M.D. prescribe under Medicare Part D? ▼
In 2023, Karen Herbst, PH.D., M.D. wrote 85 Medicare Part D claims totaling $27K in drug costs for 18 beneficiaries.
Where is Karen Herbst, PH.D., M.D. located? ▼
Karen Herbst, PH.D., M.D. is located at 6365 E TANQUE VERDE RD STE 200, Tucson, AZ, 85715. Phone: (520) 719-1610.
What is Karen Herbst, PH.D., M.D.'s NPI number? ▼
Karen Herbst, PH.D., M.D.'s National Provider Identifier (NPI) is 1114977840, issued on 05/11/2006.
Does Karen Herbst, PH.D., M.D. prescribe more brand-name or generic drugs? ▼
Karen Herbst, PH.D., M.D.'s prescribing is 19% brand-name and 81% generic drugs by claim count, with $24K in brand drug costs.
How many Endocrinology, Diabetes & Metabolism Physician providers are there in the US? ▼
There are 7,852 Endocrinology, Diabetes & Metabolism Physician providers across 54 states in the US. The average Endocrinology, Diabetes & Metabolism Physician provider writes 2,639 Medicare Part D claims per year.
What drugs does Karen Herbst, PH.D., M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Karen Herbst, PH.D., M.D.'s most frequently prescribed drugs include Dextroamphetamine Sulfate, Pentoxifylline, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Herbst, PH.D., M.D. accept Medicare? ▼
Karen Herbst, PH.D., M.D. appears in CMS Medicare data with 85 Part D claims and 18 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Herbst, PH.D., M.D.'s credentials? ▼
Karen Herbst, PH.D., M.D.'s NPI is 1114977840 with credentials PH.D., 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.
- 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.