Shannon Duffy, MMSC, PA-C
Physician Assistant · Boulder, CO
Shannon Duffy, MMSC, PA-C is a physician assistant with a practice address in Boulder, Colorado, and NPI 1902577604, issued on Sep 22, 2021. Check the license with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Shannon Duffy
- Credential
- MMSC, PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 11447 GA
Self-reported in NPPES; status is on the state search - Practice location
- 2400 Spruce St Ste 101, Boulder, CO 80302
- Phone
- (404) 321-4600
- Enumerated
- Sep 22, 2021
- Record last updated
- Aug 13, 2025
- Medicare enrollment
- Enrolled (PECOS I20250827000494); accepts Medicare assignment
- Medical or professional school
- Emory University School Of Medicine, 2022
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,767 in Colorado → Look up another NPI →
Also registered at 2400 Spruce St Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ann Carrico, PT, MPT, C.PED.Physical Therapist1285780361
- Kirsten Whiting, CMS, DPTPhysical Therapist1205904802
Verify Shannon Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average physician assistant in 2024
365 Medicare Part D claims for 191 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Clobetasol Propionate90 claims
- Triamcinolone Acetonide48 claims
- Nystatin-Triamcinolone22 claims
- Doxycycline Hyclate20 claims
- Ketoconazole20 claims
- Dupixent Pen14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $432.69
24 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Rocky Mountain Dermatology, P.C.Boulder, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Shannon Duffy among 3,767 physician assistant records in Colorado
Shannon Duffy, MMSC, PA-C is one of 3,767 physician assistant records with a practice address in Colorado. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 72% of them.
- NPI issued2021 · 72% of these records are older, 21% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2022 · median 2017 among the 2,351 with a school on file
- Record last updated2025 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
100 physician assistant records list a practice address in Boulder
They are 100 of the 5,635 NPPES records with a practice address in Boulder, and 3,767 physician assistant records in Colorado.
All 3,767 in Colorado → Every provider in Boulder → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- David Colling, PA-CBoulder, CO 803021518551100
- Rebecca Kasperbauer, PA-CBoulder, CO 803021386983542
- Kelly Kolar, PA-CBoulder, CO 803021427550300
- Janae Ross, PA CBoulder, CO 803021093918377
- Kaitlan Barrow, PA-CBoulder, CO 803011366012924
- Sally BellBoulder, CO 803011336959808
- Dana Benner, PA-CBoulder, CO 803031629129291
- Anthony CarcellaBoulder, CO 803031699856377
Common questions
What is Shannon Duffy, MMSC, PA-C's NPI number?
Shannon Duffy, MMSC, PA-C's National Provider Identifier (NPI) is 1902577604, issued on Sep 22, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Shannon Duffy, MMSC, PA-C located?
The NPPES record lists a practice address at 2400 Spruce St Ste 101, Boulder, CO, 80302. Phone: (404) 321-4600. Providers update this record themselves, so call before visiting.
How can I verify Shannon Duffy, MMSC, PA-C's license?
Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does Shannon Duffy, MMSC, PA-C prescribe under Medicare Part D?
In 2024, Shannon Duffy, MMSC, PA-C had 365 Medicare Part D claims for 191 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.