2026 NPPES data Medical-Surgical Registered Nurse NPI 1154943991 RN
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CLAIRE GREGSON, RN

Medical-Surgical Registered Nurse in MARYVILLE, Missouri. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
1K
Medicare Part D claims · 88 beneficiaries · Medical-Surgical Registered Nurse avg: 798
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: CLAIRE GREGSON, RN is a Medical-Surgical Registered Nurse ([object Object]) practicing in MARYVILLE, Missouri with a Medicare Part D prescribing footprint of 1K claims across 88 beneficiaries — 8% brand-name prescribing .

What stands out: CLAIRE GREGSON, RN filed 1,052 Medicare Part D claims in 2023 across MARYVILLE, Missouri. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

CLAIRE GREGSON, RN at a glance

Quality data not reported

NPI registry status

Active

Issued 05/14/2020

NPI 1154943991

Primary specialty

Medical-Surgical Registered Nurse

Niche

3,523 US NPIs in this specialty

Medicare Part D claims

1,052 32% vs specialty avg

2023 prescription claims

Specialty avg: 798

Specialty distribution in Missouri

How Medical-Surgical Registered Nurse compares to other specialties among Missouri providers

Missouri providers

Medical-Surgical Registered Nurse share within Missouri

1. Medical-Surgical Registered Nurse42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Medical-Surgical Registered Nurse share within Missouri

Specialty board-certification context

Estimated specialty board-certified rate — Medical-Surgical Registered Nurse (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Medical-Surgical Registered Nurse ABMS/AOA estimate

Est. board-certified rate (Medical-Surgical Registered Nurse) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Medical-Surgical Registered Nurse) — ABMS / AOA estimate

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).

CLAIRE GREGSON, RN is a Medical-Surgical Registered Nurse provider practicing in MARYVILLE, Missouri, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: RN. NPI: 1154943991. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

CLAIRE GREGSON, RN appears in the CMS NPPES registry as a Medical-Surgical Registered Nurse provider holding RN credentials at 2016 S MAIN ST, MARYVILLE, MO, 64468, with a listed phone of (660) 562-2600. NPI 1154943991 was issued on 05/14/2020. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GREGSON most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 1,052 prescription claims written by this provider, covering 88 Medicare beneficiaries and totaling roughly $85K in drug spend, split 8% brand-name and 92% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Medical-Surgical Registered Nurse is a narrow specialty nationwide, with 3,523 enrolled providers across 54 states and an average of 798 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

2016 S MAIN ST
MARYVILLE, MO 64468

Provider Details

NPI 1154943991
Specialty Medical-Surgical Registered Nurse
Credentials RN
Gender Female
NPI Issued 05/14/2020

Hospital and facility affiliations

Facilities where CLAIRE GREGSON, RN 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.

MOSAIC MEDICAL CENTER - MARYVILLE
MARYVILLE, MO
Critical Access Hospitals
CMS CCN: 261340

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 · Generic-heavy

CLAIRE GREGSON, RN — brand share 8.0%
Specialty average (est.)

8% brand-name claims vs 92% generic, on 1,052 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.

1,052
Total Claims
$85K
Total Drug Cost
88
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
2,317
Total Day Supply
67,887
Brand vs Generic
8% brand / 92% generic
Brand Drug Cost
$62K
Generic Drug Cost
$22K
Antibiotic Claims
41

Patient Demographics

Average Patient Age
81.8 years
Avg HCC Risk Score
2.44
Gender Split
73% female / 27% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Furosemide
44
Atorvastatin Calcium
41
Levothyroxine Sodium
38
Omeprazole
35
Metoprolol Succinate
31
Lisinopril
29
Losartan Potassium
27
Potassium Chloride
26
Amlodipine Besylate
25
Carvedilol
25

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Medical-Surgical Registered Nurse Overview

How CLAIRE GREGSON, RN fits within the Medical-Surgical Registered Nurse landscape nationally.

3,523
Medical-Surgical Registered Nurse Providers in US
54
States with Medical-Surgical Registered Nurse
798
Avg Claims per Provider

CLAIRE GREGSON, RN's 1,052 claims are above the specialty average of 798.

Nearby Medical-Surgical Registered Nurse Providers in Missouri

Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as GREGSON.

Compare Medical-Surgical Registered Nurse nationally: see state-by-state distribution →

Frequently Asked Questions

What is CLAIRE GREGSON, RN's specialty?
CLAIRE GREGSON, RN specializes in Medical-Surgical Registered Nurse and practices in MARYVILLE, Missouri. Credentials: RN.
How much does CLAIRE GREGSON, RN prescribe under Medicare Part D?
In 2023, CLAIRE GREGSON, RN wrote 1,052 Medicare Part D claims totaling $85K in drug costs for 88 beneficiaries.
Where is CLAIRE GREGSON, RN located?
CLAIRE GREGSON, RN is located at 2016 S MAIN ST, MARYVILLE, MO, 64468. Phone: (660) 562-2600.
What is CLAIRE GREGSON, RN's NPI number?
CLAIRE GREGSON, RN's National Provider Identifier (NPI) is 1154943991, issued on 05/14/2020.
Does CLAIRE GREGSON, RN prescribe more brand-name or generic drugs?
CLAIRE GREGSON, RN's prescribing is 8% brand-name and 92% generic drugs by claim count, with $62K in brand drug costs.
How many Medical-Surgical Registered Nurse providers are there in the US?
There are 3,523 Medical-Surgical Registered Nurse providers across 54 states in the US. The average Medical-Surgical Registered Nurse provider writes 798 Medicare Part D claims per year.
What drugs does CLAIRE GREGSON, RN prescribe most often?
Based on 2023 Medicare Part D data, CLAIRE GREGSON, RN's most frequently prescribed drugs include Furosemide, Atorvastatin Calcium, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does CLAIRE GREGSON, RN accept Medicare?
CLAIRE GREGSON, RN appears in CMS Medicare data with 1,052 Part D claims and 88 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CLAIRE GREGSON, RN's credentials?
CLAIRE GREGSON, RN's NPI is 1154943991 with credentials RN. 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

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