NPI registry status
Active
2026 NPPES data Nurse Practitioner NPI 1437806643 AGNP-C
Verify on CMS → Margaret Stubbs, AGNP-C
Nurse Practitioner in Kalamazoo, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 87,700 in Nurse Practitioner, 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
8K
Medicare Part D claims · 178 beneficiaries · Nurse Practitioner avg: 1K
Generic prescribing
85%
generic claims · 14% 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
Margaret Stubbs, AGNP-C filed 8,344 Medicare Part D claims in 2023 as a Nurse Practitioner in Kalamazoo, Michigan, prescribing 85% generic.
- 8K
- 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.
Margaret Stubbs, AGNP-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
8,344 Top 3% higher than 97% 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 Margaret Stubbs, AGNP-C?
Quality data not reportedPrimary specialty
Nurse Practitioner
Medicare Part D claims
8,344 8× vs specialty avg
Specialty distribution in Michigan
How Nurse Practitioner compares to other specialties among Michigan 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 Nurse Practitioner. 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).
Margaret Stubbs, AGNP-C appears in the CMS NPPES registry as a Nurse Practitioner provider holding AGNP-C credentials at 445 W MICHIGAN AVE, Kalamazoo, MI, 49007, with a listed phone of (269) 488-5460. NPI 1437806643 was issued on 03/08/2022.
Medicare Part D records for calendar year 2023 show 8,344 prescription claims written by this provider, covering 178 Medicare beneficiaries and totaling roughly $843K in drug spend, split 14% brand-name and 85% generic by claim count, with an opioid prescribing rate of 3.2%.
Nurse Practitioner is a high-volume specialty nationwide, with 87,700 enrolled providers across 56 states and an average of 1,084 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 | 1437806643 |
|---|---|
| Specialty | Nurse Practitioner |
| Credentials | AGNP-C |
| Gender | Female |
| NPI Issued | 03/08/2022 |
License & disciplinary context - Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 - they are NOT specific to Margaret Stubbs, AGNP-C. To verify Margaret Stubbs, AGNP-C's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Margaret Stubbs, AGNP-C - brand share 14.0%
Nurse Practitioner average
14% brand-name claims vs 85% generic, on 8,344 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.
8,344
Total Claims
$843K
Total Drug Cost
178
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,456
- Total Day Supply
- 169,858
- Brand vs Generic
- 14% brand / 85% generic
- Brand Drug Cost
- $556K
- Generic Drug Cost
- $285K
- Opioid Claims
- 263 (3.2% rate)
- Antibiotic Claims
- 189
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 4.00
- Gender Split
- 72% female / 28% male
- Age Distribution
- <65: 28, 65-74: 70, 75-84: 52, 85+: 28
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Margaret Stubbs, AGNP-C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
596 claims
- Metoprolol Succinate
Metoprolol Succinate
338 claims
- Furosemide
Furosemide
306 claims
- Amlodipine Besylate
Amlodipine Besylate
269 claims
- Levothyroxine Sodium
Levothyroxine Sodium
254 claims
- Eliquis 236
Eliquis
236 claims
- Gabapentin 214
Gabapentin
214 claims
- Lisinopril 200
Lisinopril
200 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 596 |
| Metoprolol Succinate | 338 |
| Furosemide | 306 |
| Amlodipine Besylate | 269 |
| Levothyroxine Sodium | 254 |
| Eliquis Apixaban | 236 |
| Gabapentin | 214 |
| Lisinopril | 200 |
| Tamsulosin Hcl | 199 |
| Sertraline Hcl | 183 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nurse Practitioner Overview
How Margaret Stubbs, AGNP-C fits within the Nurse Practitioner landscape nationally.
87,700
Nurse Practitioner Providers in US
56
States with Nurse Practitioner
1,084
Avg Claims per Provider
Margaret Stubbs, AGNP-C's 8,344 claims are above the specialty average of 1,084.
Nearby Nurse Practitioner Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Stubbs.
Dr. Amina Abair
NP-C
Flint, MI
Heba Abazid
Dearborn Heights, MI
Dr. Azra Abbasi
AGNP-C
Okemos, MI
Dr. Linda Abbo
FNP-C
Farmington Hills, MI
Dr. Bilal Abdulla
NP
Dearborn, MI
Compare Nurse Practitioner 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 Michigan medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nurse Practitioner 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 Margaret Stubbs, AGNP-C's specialty? ▼
Margaret Stubbs, AGNP-C specializes in Nurse Practitioner and practices in Kalamazoo, Michigan. Credentials: AGNP-C.
How much does Margaret Stubbs, AGNP-C prescribe under Medicare Part D? ▼
In 2023, Margaret Stubbs, AGNP-C wrote 8,344 Medicare Part D claims totaling $843K in drug costs for 178 beneficiaries.
Where is Margaret Stubbs, AGNP-C located? ▼
Margaret Stubbs, AGNP-C is located at 445 W MICHIGAN AVE, Kalamazoo, MI, 49007. Phone: (269) 488-5460.
What is Margaret Stubbs, AGNP-C's NPI number? ▼
Margaret Stubbs, AGNP-C's National Provider Identifier (NPI) is 1437806643, issued on 03/08/2022.
Does Margaret Stubbs, AGNP-C prescribe more brand-name or generic drugs? ▼
Margaret Stubbs, AGNP-C's prescribing is 14% brand-name and 85% generic drugs by claim count, with $556K in brand drug costs.
Does Margaret Stubbs, AGNP-C prescribe opioids? ▼
Yes, Margaret Stubbs, AGNP-C had 263 opioid claims in 2023 with an opioid prescribing rate of 3.2%.
How many Nurse Practitioner providers are there in the US? ▼
There are 87,700 Nurse Practitioner providers across 56 states in the US. The average Nurse Practitioner provider writes 1,084 Medicare Part D claims per year.
What drugs does Margaret Stubbs, AGNP-C prescribe most often? ▼
Based on 2023 Medicare Part D data, Margaret Stubbs, AGNP-C's most frequently prescribed drugs include Atorvastatin Calcium, Metoprolol Succinate, Furosemide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Margaret Stubbs, AGNP-C accept Medicare? ▼
Margaret Stubbs, AGNP-C appears in CMS Medicare data with 8,344 Part D claims and 178 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Margaret Stubbs, AGNP-C's credentials? ▼
Margaret Stubbs, AGNP-C's NPI is 1437806643 with credentials AGNP-C. 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.