NPI registry status
Active
2026 NPPES data Psychiatric/Mental Health Nurse Practitioner NPI 1164736559 FPMHNP
Verify on CMS → Karl Stammer, FPMHNP
Psychiatric/Mental Health Nurse Practitioner in Joplin, Missouri.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40,776 in Psychiatric/Mental Health 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
10K
Medicare Part D claims · 404 beneficiaries · Psychiatric/Mental Health Nurse Practitioner avg: 927
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.2K
14 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Karl Stammer, FPMHNP filed 10,212 Medicare Part D claims in 2023 as a Psychiatric/Mental Health Nurse Practitioner in Joplin, Missouri, prescribing 88% generic.
- 10K
- Part D claims, 2023
- 88%
- generic prescribing
- $1.2K
- industry payments (Sunshine Act)
- ≥98th
- 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.
Karl Stammer, FPMHNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
10,212 ≥ 98th percentile 98% 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
What does the federal data show about Karl Stammer, FPMHNP?
Quality data not reportedPrimary specialty
Psychiatric/Mental Health Nurse Practitioner
Medicare Part D claims
10,212 11× vs specialty avg
Specialty distribution in Missouri
How Psychiatric/Mental Health Nurse Practitioner compares to other specialties among Missouri 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 Psychiatric/Mental Health 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).
Karl Stammer, FPMHNP appears in the CMS NPPES registry as a Psychiatric/Mental Health Nurse Practitioner provider holding FPMHNP credentials at 3901 E 32ND ST, Joplin, MO, 64804, with a listed phone of (417) 347-7565. NPI 1164736559 was issued on 07/28/2010.
Medicare Part D records for calendar year 2023 show 10,212 prescription claims written by this provider, covering 404 Medicare beneficiaries and totaling roughly $3.5 million in drug spend, split 12% brand-name and 88% generic by claim count.
Psychiatric/Mental Health Nurse Practitioner is a mid-sized specialty nationwide, with 40,776 enrolled providers across 54 states and an average of 927 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 | 1164736559 |
|---|---|
| Specialty | Psychiatric/Mental Health Nurse Practitioner |
| Credentials | FPMHNP |
| Gender | Male |
| NPI Issued | 07/28/2010 |
Hospital and facility affiliations
Facilities where Karl Stammer, FPMHNP 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.
Ozark Center
Joplin, MO
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 Karl Stammer, FPMHNP. Source: openpaymentsdata.cms.gov.
Total received
$1.2K
Largest payer
ABBVIE 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.
Brand vs generic prescribing mix · Typical
Karl Stammer, FPMHNP - brand share 12.0%
Psychiatric/Mental Health Nurse Practitioner average
12% brand-name claims vs 88% generic, on 10,212 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.
10,212
Total Claims
$3.5M
Total Drug Cost
404
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 13,432
- Total Day Supply
- 369,736
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $3.0M
- Generic Drug Cost
- $464K
Patient Demographics
- Average Patient Age
- 57.7 years
- Avg HCC Risk Score
- 1.50
- Gender Split
- 51% female / 49% male
- Age Distribution
- <65: 257, 65-74: 117, 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 Karl Stammer, FPMHNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Aripiprazole
Aripiprazole
743 claims
- Buspirone Hcl
Buspirone Hcl
584 claims
- Trazodone Hcl
Trazodone Hcl
481 claims
- Quetiapine Fumarate
Quetiapine Fumarate
417 claims
- Hydroxyzine Hcl
Hydroxyzine Hcl
370 claims
- Prazosin Hcl
Prazosin Hcl
370 claims
- Doxepin Hcl
Doxepin Hcl
359 claims
- Fluoxetine Hcl
Fluoxetine Hcl
321 claims
| Drug | Claims |
|---|---|
| Aripiprazole | 743 |
| Buspirone Hcl | 584 |
| Trazodone Hcl | 481 |
| Quetiapine Fumarate | 417 |
| Hydroxyzine Hcl | 370 |
| Prazosin Hcl | 370 |
| Doxepin Hcl | 359 |
| Fluoxetine Hcl | 321 |
| Vraylar Cariprazine Hcl | 317 |
| Mirtazapine | 295 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Psychiatric/Mental Health Nurse Practitioner in MO →
All providers in Missouri →
Compare specialties →
Psychiatric/Mental Health Nurse Practitioner Overview
How Karl Stammer, FPMHNP fits within the Psychiatric/Mental Health Nurse Practitioner landscape nationally.
40,776
Psychiatric/Mental Health Nurse Practitioner Providers in US
54
States with Psychiatric/Mental Health Nurse Practitioner
927
Avg Claims per Provider
Karl Stammer, FPMHNP's 10,212 claims are above the specialty average of 927.
Nearby Psychiatric/Mental Health Nurse Practitioner Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Stammer.
Laura Aboud
Kansas City, MO
Dr. Brittany Adams
DNP, APRN, PMHNP
Saint Joseph, MO
Dr. James Adams
PMHNP-BC
Saint Peters, MO
Dr. Fatma Ahmouda
PMHNP-BC
Columbia, MO
Dr. Chynwe Ahumaraeze
ARNP
Independence, MO
Compare Psychiatric/Mental Health 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatric/Mental Health 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 Karl Stammer, FPMHNP's specialty? ▼
Karl Stammer, FPMHNP specializes in Psychiatric/Mental Health Nurse Practitioner and practices in Joplin, Missouri. Credentials: FPMHNP.
How much does Karl Stammer, FPMHNP prescribe under Medicare Part D? ▼
In 2023, Karl Stammer, FPMHNP wrote 10,212 Medicare Part D claims totaling $3.5M in drug costs for 404 beneficiaries.
Where is Karl Stammer, FPMHNP located? ▼
Karl Stammer, FPMHNP is located at 3901 E 32ND ST, Joplin, MO, 64804. Phone: (417) 347-7565.
What is Karl Stammer, FPMHNP's NPI number? ▼
Karl Stammer, FPMHNP's National Provider Identifier (NPI) is 1164736559, issued on 07/28/2010.
Does Karl Stammer, FPMHNP prescribe more brand-name or generic drugs? ▼
Karl Stammer, FPMHNP's prescribing is 12% brand-name and 88% generic drugs by claim count, with $3.0M in brand drug costs.
How many Psychiatric/Mental Health Nurse Practitioner providers are there in the US? ▼
There are 40,776 Psychiatric/Mental Health Nurse Practitioner providers across 54 states in the US. The average Psychiatric/Mental Health Nurse Practitioner provider writes 927 Medicare Part D claims per year.
What drugs does Karl Stammer, FPMHNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Karl Stammer, FPMHNP's most frequently prescribed drugs include Aripiprazole, Buspirone Hcl, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karl Stammer, FPMHNP accept Medicare? ▼
Karl Stammer, FPMHNP appears in CMS Medicare data with 10,212 Part D claims and 404 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karl Stammer, FPMHNP's credentials? ▼
Karl Stammer, FPMHNP's NPI is 1164736559 with credentials FPMHNP. 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.