NPI registry status
Active
2026 NPPES data Critical Care Medicine Registered Nurse NPI 1336710946
Verify on CMS → Frank Duffin
Critical Care Medicine Registered Nurse in Charleston, South Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,553 in Critical Care Medicine Registered Nurse, 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.
What the federal data shows
Frank Duffin is a Critical Care Medicine Registered Nurse in Charleston, South Carolina, listed in the federal CMS National Provider Identifier registry.
- #74
- Critical Care Medicine Registered Nurse rank among South Carolina specialties
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 1336710946 · Critical Care Medicine Registered Nurse
NPI-10 · ENUM-RECENT · TAX-MID · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1336710946
- ENUM-RECENT 2021
- TAX-MID 7K Critical Care
- RX-NONE No Part D
- BOOK-THIN 151 in South Carolina
- PHOTO-ENUM Shelagh Cunningham · 2021
What does the federal data show about Frank Duffin?
Quality data not reportedPrimary specialty
Critical Care Medicine Registered Nurse
Specialty distribution in South Carolina
How Critical Care Medicine Registered Nurse compares to other specialties among South Carolina 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 Critical Care Medicine Registered Nurse. 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 | 1336710946 |
|---|---|
| Specialty | Critical Care Medicine Registered Nurse |
| Gender | Male |
| NPI Issued | 07/06/2021 |
Hospital and facility affiliations
Facilities where Frank Duffin 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.
Medical University Hospital Authority
Charleston, SC
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
More Critical Care Medicine Registered Nurse in SC →
All providers in South Carolina →
Compare specialties →
Critical Care Medicine Registered Nurse Overview
How Frank Duffin fits within the Critical Care Medicine Registered Nurse landscape nationally.
6,553
Critical Care Medicine Registered Nurse Providers in US
53
States with Critical Care Medicine Registered Nurse
752
Avg Claims per Provider
Nationwide Critical Care Medicine Registered Nurse peers with similar MIPS or enrollment year
Two federal-record peer sets for Duffin, both outside South Carolina so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2021)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Critical Care Medicine Registered Nurse Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Duffin.
One of 151 Critical Care Medicine Registered Nurse providers enrolled in South Carolina, 5 are shown here.
Amber Al-Abed
Charleston, SC
Jonathan Anderson
Charleston, SC
Dr. Lindsi Angel
CRNA
Conway, SC
Shacoya Arthur
North Charleston, SC
Ashleigh Bailey
Fountain Inn, SC
Compare Critical Care Medicine Registered Nurse nationally: see state-by-state distribution →
Frequently Asked Questions
What is Frank Duffin's specialty? ▼
Frank Duffin specializes in Critical Care Medicine Registered Nurse and practices in Charleston, South Carolina.
Where is Frank Duffin located? ▼
Frank Duffin is located at 171 ASHLEY AVE, Charleston, SC, 29425. Phone: (843) 792-1414.
What is Frank Duffin's NPI number? ▼
Frank Duffin's National Provider Identifier (NPI) is 1336710946, issued on 07/06/2021.
How many Critical Care Medicine Registered Nurse providers are there in the US? ▼
There are 6,553 Critical Care Medicine Registered Nurse providers across 53 states in the US. The average Critical Care Medicine Registered Nurse provider writes 752 Medicare Part D claims per year.
Does Frank Duffin accept Medicare? ▼
Frank Duffin appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Frank Duffin's credentials? ▼
Frank Duffin's NPI is 1336710946. 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.
- 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.