NPI registry status
Active
2026 NPPES data Family Nurse Practitioner NPI 1134378532 FNP-BC
Verify on CMS → Sarah Somerfield, FNP-BC
Family Nurse Practitioner in West Branch, 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 210,832 in Family 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
515
Medicare Part D claims · 250 beneficiaries · Family Nurse Practitioner avg: 1K
Generic prescribing
81%
generic claims · 19% 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
Sarah Somerfield, FNP-BC filed 515 Medicare Part D claims in 2023 as a Family Nurse Practitioner in West Branch, Michigan, prescribing 81% generic.
- 515
- Part D claims, 2023
- 81%
- generic prescribing
- ≥66th
- 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.
CMS NPPES provider registry desk
NPI 1134378532 · Family Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1134378532
- ENUM-MID 2008
- TAX-MEGA 211K Family Nurse
- RX-LIGHT 515
- BOOK-LIGHT 4,866 in Michigan
- PHOTO-ENUM Karen Millett · 2008
Sarah Somerfield, FNP-BC's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
515 ≥ 66th percentile 66% 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 Sarah Somerfield, FNP-BC?
Quality data not reportedPrimary specialty
Family Nurse Practitioner
Medicare Part D claims
515 58% vs specialty avg
Specialty distribution in Michigan
How Family 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 Family 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).
Practice Address
Provider Details
| NPI | 1134378532 |
|---|---|
| Specialty | Family Nurse Practitioner |
| Credentials | FNP-BC |
| Gender | Female |
| NPI Issued | 09/10/2008 |
Hospital and facility affiliations
Facilities where Sarah Somerfield, FNP-BC 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.
Mymichigan Medical Center West Branch
★★★★★ 5/5
West Branch, MI
Acute Care Hospitals
CMS CCN: 230095
Mymichigan Medical Center Alpena
★★★☆☆ 3/5
Alpena, MI
Acute Care Hospitals
CMS CCN: 230036
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Sarah Somerfield, FNP-BC. To verify Sarah Somerfield, FNP-BC'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
Sarah Somerfield, FNP-BC - brand share 19.0%
Family Nurse Practitioner average
19% brand-name claims vs 81% generic, on 515 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.
515
Total Claims
$18K
Total Drug Cost
250
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 519
- Total Day Supply
- 7,198
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $14K
- Generic Drug Cost
- $5K
- Opioid Claims
- 34 (6.6% rate)
- Antibiotic Claims
- 132
Patient Demographics
- Average Patient Age
- 71.9 years
- Avg HCC Risk Score
- 1.59
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 47, 65-74: 101, 75-84: 75, 85+: 27
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Sarah Somerfield, FNP-BC prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cephalexin
Cephalexin
42 claims
- Methylprednisolone
Methylprednisolone
36 claims
- Eliquis
Eliquis
28 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
27 claims
- Fluvoxamine Maleate
Fluvoxamine Maleate
26 claims
- Azithromycin
Azithromycin
24 claims
- Ondansetron Odt
Ondansetron Odt
24 claims
- Levothyroxine Sodium
Levothyroxine Sodium
22 claims
| Drug | Claims |
|---|---|
| Cephalexin | 42 |
| Methylprednisolone | 36 |
| Eliquis Apixaban | 28 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 27 |
| Fluvoxamine Maleate | 26 |
| Azithromycin | 24 |
| Ondansetron Odt Ondansetron | 24 |
| Levothyroxine Sodium | 22 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 19 |
| Potassium Chloride | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Nurse Practitioner Overview
How Sarah Somerfield, FNP-BC fits within the Family Nurse Practitioner landscape nationally.
210,832
Family Nurse Practitioner Providers in US
56
States with Family Nurse Practitioner
1,222
Avg Claims per Provider
Sarah Somerfield, FNP-BC's 515 claims are below the specialty average of 1,222.
Nationwide Family Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Somerfield, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Nurse Practitioner Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Somerfield.
One of 4,866 Family Nurse Practitioner providers enrolled in Michigan, 5 are shown here.
Dr. Leila Abbas
NP
Inkster, MI
Norma Abbott
Caro, MI
Dr. Bianca Abboud
FNP
Saginaw, MI
Dr. Fatima Abdallah
FNP-BC
Dearborn, MI
Dr. Fatmeh Abdallah
FNP
Dearborn, MI
Compare Family Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Sarah Somerfield, FNP-BC's specialty? ▼
Sarah Somerfield, FNP-BC specializes in Family Nurse Practitioner and practices in West Branch, Michigan. Credentials: FNP-BC.
How much does Sarah Somerfield, FNP-BC prescribe under Medicare Part D? ▼
In 2023, Sarah Somerfield, FNP-BC wrote 515 Medicare Part D claims totaling $18K in drug costs for 250 beneficiaries.
Where is Sarah Somerfield, FNP-BC located? ▼
Sarah Somerfield, FNP-BC is located at 611 COURT ST, West Branch, MI, 48661. Phone: (989) 345-7000.
What is Sarah Somerfield, FNP-BC's NPI number? ▼
Sarah Somerfield, FNP-BC's National Provider Identifier (NPI) is 1134378532, issued on 09/10/2008.
Does Sarah Somerfield, FNP-BC prescribe more brand-name or generic drugs? ▼
Sarah Somerfield, FNP-BC's prescribing is 19% brand-name and 81% generic drugs by claim count, with $14K in brand drug costs.
Does Sarah Somerfield, FNP-BC prescribe opioids? ▼
Yes, Sarah Somerfield, FNP-BC had 34 opioid claims in 2023 with an opioid prescribing rate of 6.6%.
How many Family Nurse Practitioner providers are there in the US? ▼
There are 210,832 Family Nurse Practitioner providers across 56 states in the US. The average Family Nurse Practitioner provider writes 1,222 Medicare Part D claims per year.
What drugs does Sarah Somerfield, FNP-BC prescribe most often? ▼
Based on 2023 Medicare Part D data, Sarah Somerfield, FNP-BC's most frequently prescribed drugs include Cephalexin, Methylprednisolone, Eliquis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Sarah Somerfield, FNP-BC accept Medicare? ▼
Sarah Somerfield, FNP-BC appears in CMS Medicare data with 515 Part D claims and 250 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Sarah Somerfield, FNP-BC's credentials? ▼
Sarah Somerfield, FNP-BC's NPI is 1134378532 with credentials FNP-BC. 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.