NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1417362880 DO
Verify on CMS → Jessica Underhill, DO
General Practice Physician in Saint Peters, 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 16,725 in General Practice 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
8K
Medicare Part D claims · 643 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Jessica Underhill, DO filed 8,089 Medicare Part D claims in 2023 as a General Practice Physician in Saint Peters, Missouri, prescribing 88% generic.
- 8K
- Part D claims, 2023
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Jessica Underhill, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
8,089 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
✓
Board certification likely (heuristic, not verified)
Jessica Underhill, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Jessica Underhill, DO?
Quality data not reportedPrimary specialty
General Practice Physician
Medicare Part D claims
8,089 182% vs specialty avg
Specialty distribution in Missouri
How General Practice Physician 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 General Practice 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).
Jessica Underhill, DO appears in the CMS NPPES registry as a General Practice Physician provider holding DO credentials at 6994 MEXICO RD, Saint Peters, MO, 63376, with a listed phone of (636) 397-3231. NPI 1417362880 was issued on 06/24/2014.
Medicare Part D records for calendar year 2023 show 8,089 prescription claims written by this provider, covering 643 Medicare beneficiaries and totaling roughly $633K in drug spend, split 12% brand-name and 88% generic by claim count, with an opioid prescribing rate of 3.9%.
General Practice Physician is a mid-sized specialty nationwide, with 16,725 enrolled providers across 56 states and an average of 2,872 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 | 1417362880 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 06/24/2014 |
Hospital and facility affiliations
Facilities where Jessica Underhill, DO 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.
Aging Well Health Care, LLC
Saint Louis, MO
Ssm Medical Group Inc
Saint Peters, 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).
Brand vs generic prescribing mix · Typical
Jessica Underhill, DO - brand share 12.0%
General Practice Physician average
12% brand-name claims vs 88% generic, on 8,089 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.
8,089
Total Claims
$633K
Total Drug Cost
643
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 18,756
- Total Day Supply
- 543,465
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $474K
- Generic Drug Cost
- $157K
- Opioid Claims
- 319 (3.9% rate)
- Antibiotic Claims
- 117
Patient Demographics
- Average Patient Age
- 72.0 years
- Avg HCC Risk Score
- 1.32
- Gender Split
- 65% female / 35% male
- Age Distribution
- <65: 70, 65-74: 349, 75-84: 159, 85+: 65
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Jessica Underhill, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
473 claims
- Levothyroxine Sodium
Levothyroxine Sodium
410 claims
- Lisinopril
Lisinopril
263 claims
- Losartan Potassium
Losartan Potassium
263 claims
- Alprazolam
Alprazolam
238 claims
- Pantoprazole Sodium
Pantoprazole Sodium
221 claims
- Omeprazole
Omeprazole
213 claims
- Hydrochlorothiazide
Hydrochlorothiazide
199 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 473 |
| Levothyroxine Sodium | 410 |
| Lisinopril | 263 |
| Losartan Potassium | 263 |
| Alprazolam | 238 |
| Pantoprazole Sodium | 221 |
| Omeprazole | 213 |
| Hydrochlorothiazide | 199 |
| Metformin Hcl | 187 |
| Amlodipine Besylate | 179 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Physician Overview
How Jessica Underhill, DO fits within the General Practice Physician landscape nationally.
16,725
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider
Jessica Underhill, DO's 8,089 claims are above the specialty average of 2,872.
Nearby General Practice Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Underhill.
Dr. Eva Aagaard
MD
Saint Louis, MO
Dr. Mark Adderley
D.O.
Festus, MO
Dr. Trinidad Aguilera
M.D.
Moberly, MO
Dr. Maria Albano
MD
Festus, MO
Dr. Juan Alcaide
MD
Fort Leonard Wood, MO
Compare General Practice 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby General Practice 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 Jessica Underhill, DO's specialty? ▼
Jessica Underhill, DO specializes in General Practice Physician and practices in Saint Peters, Missouri. Credentials: DO.
How much does Jessica Underhill, DO prescribe under Medicare Part D? ▼
In 2023, Jessica Underhill, DO wrote 8,089 Medicare Part D claims totaling $633K in drug costs for 643 beneficiaries.
Where is Jessica Underhill, DO located? ▼
Jessica Underhill, DO is located at 6994 MEXICO RD, Saint Peters, MO, 63376. Phone: (636) 397-3231.
What is Jessica Underhill, DO's NPI number? ▼
Jessica Underhill, DO's National Provider Identifier (NPI) is 1417362880, issued on 06/24/2014.
Does Jessica Underhill, DO prescribe more brand-name or generic drugs? ▼
Jessica Underhill, DO's prescribing is 12% brand-name and 88% generic drugs by claim count, with $474K in brand drug costs.
Does Jessica Underhill, DO prescribe opioids? ▼
Yes, Jessica Underhill, DO had 319 opioid claims in 2023 with an opioid prescribing rate of 3.9%.
How many General Practice Physician providers are there in the US? ▼
There are 16,725 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does Jessica Underhill, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Jessica Underhill, DO's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Jessica Underhill, DO accept Medicare? ▼
Jessica Underhill, DO appears in CMS Medicare data with 8,089 Part D claims and 643 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Jessica Underhill, DO's credentials? ▼
Jessica Underhill, DO's NPI is 1417362880 with credentials DO. 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.