NPI registry status
Active
2026 NPPES data General Practice Registered Nurse NPI 1649548686 FNP
Verify on CMS → Karen Greenhaw, FNP
General Practice Registered Nurse in Penn Valley, 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 5,532 in General Practice Registered Nurse, 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 · 266 beneficiaries · General Practice Registered Nurse avg: 1K
Generic prescribing
89%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$181.45
8 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 Greenhaw, FNP filed 1,291 Medicare Part D claims in 2023 as a General Practice Registered Nurse in Penn Valley, California, prescribing 89% generic.
- 1K
- Part D claims, 2023
- 89%
- generic prescribing
- $181.45
- 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 Greenhaw, FNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,291 Top 22% higher than 78% 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 Karen Greenhaw, FNP?
Quality data not reportedPrimary specialty
General Practice Registered Nurse
Medicare Part D claims
1,291 9% vs specialty avg
Specialty distribution in California
How General Practice Registered Nurse 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 General Practice Registered Nurse. 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 Greenhaw, FNP appears in the CMS NPPES registry as a General Practice Registered Nurse provider holding FNP credentials at 11400 PLEASANT VALLEY RD, Penn Valley, CA, 95946, with a listed phone of (530) 432-7023. NPI 1649548686 was issued on 12/06/2011.
Medicare Part D records for calendar year 2023 show 1,291 prescription claims written by this provider, covering 266 Medicare beneficiaries and totaling roughly $72K in drug spend, split 10% brand-name and 89% generic by claim count, with an opioid prescribing rate of 6.5%.
General Practice Registered Nurse is a mid-sized specialty nationwide, with 5,532 enrolled providers across 55 states and an average of 1,187 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 | 1649548686 |
|---|---|
| Specialty | General Practice Registered Nurse |
| Credentials | FNP |
| Gender | Female |
| NPI Issued | 12/06/2011 |
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 Greenhaw, FNP. Source: openpaymentsdata.cms.gov.
Total received
$181
Largest payer
GlaxoSmithKline, LLC.
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 Karen Greenhaw, FNP. To verify Karen Greenhaw, FNP'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
Karen Greenhaw, FNP - brand share 10.0%
General Practice Registered Nurse average
10% brand-name claims vs 89% generic, on 1,291 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.
1,291
Total Claims
$72K
Total Drug Cost
266
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,317
- Total Day Supply
- 65,634
- Brand vs Generic
- 10% brand / 89% generic
- Brand Drug Cost
- $40K
- Generic Drug Cost
- $32K
- Opioid Claims
- 84 (6.5% rate)
- Antibiotic Claims
- 93
Patient Demographics
- Average Patient Age
- 77.1 years
- Avg HCC Risk Score
- 1.30
- Gender Split
- 64% female / 36% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karen Greenhaw, FNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
62 claims
- Amlodipine Besylate
Amlodipine Besylate
53 claims
- Atorvastatin Calcium
Atorvastatin Calcium
50 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
40 claims
- Tramadol Hcl
Tramadol Hcl
37 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
36 claims
- Escitalopram Oxalate
Escitalopram Oxalate
34 claims
- Trazodone Hcl
Trazodone Hcl
29 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 62 |
| Amlodipine Besylate | 53 |
| Atorvastatin Calcium | 50 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 40 |
| Tramadol Hcl | 37 |
| Rosuvastatin Calcium | 36 |
| Escitalopram Oxalate | 34 |
| Trazodone Hcl | 29 |
| Gabapentin | 27 |
| Losartan Potassium | 27 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Registered Nurse Overview
How Karen Greenhaw, FNP fits within the General Practice Registered Nurse landscape nationally.
5,532
General Practice Registered Nurse Providers in US
55
States with General Practice Registered Nurse
1,187
Avg Claims per Provider
Karen Greenhaw, FNP's 1,291 claims are above the specialty average of 1,187.
Nearby General Practice Registered Nurse Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Greenhaw.
Dr. Christine Acapulco
RN
Fresno, CA
Charles Agustin
Ventura, CA
Dr. Shaheen Akram
RN
Covina, CA
Dr. Betssy Alanya
NP
Northridge, CA
Dr. Marlena Alazzam
RN
Fresno, CA
Compare General Practice Registered Nurse 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 General Practice Registered Nurse 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 Greenhaw, FNP's specialty? ▼
Karen Greenhaw, FNP specializes in General Practice Registered Nurse and practices in Penn Valley, California. Credentials: FNP.
How much does Karen Greenhaw, FNP prescribe under Medicare Part D? ▼
In 2023, Karen Greenhaw, FNP wrote 1,291 Medicare Part D claims totaling $72K in drug costs for 266 beneficiaries.
Where is Karen Greenhaw, FNP located? ▼
Karen Greenhaw, FNP is located at 11400 PLEASANT VALLEY RD, Penn Valley, CA, 95946. Phone: (530) 432-7023.
What is Karen Greenhaw, FNP's NPI number? ▼
Karen Greenhaw, FNP's National Provider Identifier (NPI) is 1649548686, issued on 12/06/2011.
Does Karen Greenhaw, FNP prescribe more brand-name or generic drugs? ▼
Karen Greenhaw, FNP's prescribing is 10% brand-name and 89% generic drugs by claim count, with $40K in brand drug costs.
Does Karen Greenhaw, FNP prescribe opioids? ▼
Yes, Karen Greenhaw, FNP had 84 opioid claims in 2023 with an opioid prescribing rate of 6.5%.
How many General Practice Registered Nurse providers are there in the US? ▼
There are 5,532 General Practice Registered Nurse providers across 55 states in the US. The average General Practice Registered Nurse provider writes 1,187 Medicare Part D claims per year.
What drugs does Karen Greenhaw, FNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Karen Greenhaw, FNP's most frequently prescribed drugs include Levothyroxine Sodium, Amlodipine Besylate, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Greenhaw, FNP accept Medicare? ▼
Karen Greenhaw, FNP appears in CMS Medicare data with 1,291 Part D claims and 266 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Greenhaw, FNP's credentials? ▼
Karen Greenhaw, FNP's NPI is 1649548686 with credentials FNP. 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.
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.