Gretchen B. Mason, PA-C
Physician Assistant · Herrin, IL
Gretchen B. Mason, PA-C is a physician assistant with a practice address in Herrin, Illinois, and NPI 1245229111, issued on Oct 13, 2005. Check the license (Illinois 0850003442, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gretchen B. Mason
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 0850003442 IL
Self-reported in NPPES; status is on the state search - Practice location
- 510 Lincoln Dr, Herrin, IL 62948
- Phone
- (618) 997-6800
- Enumerated
- Oct 13, 2005
- Record last updated
- Mar 25, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (618) 998-9124
- Medicare enrollment
- Enrolled (PECOS I20090421000340); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 510 Lincoln Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Treg Brown, MDOrthopaedic Surgery Physician1598870115
- Travis Chapman, PTPhysical Therapist1245822923
- Michele CheathamPhysical Therapist1437577434
- Hollis Clark, P.A.-C.Physician Assistant1154659894
Verify Gretchen B. Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 0850003442Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average physician assistant in 2024
125 Medicare Part D claims for 66 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 25 claims were for opioids.
Most prescribed
- Clopidogrel24 claims
- Hydrocodone-Acetaminophen20 claims
- Pantoprazole Sodium15 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $93.55
3 payments; by number, the most common kind was food and beverage; the largest payer was Amgen 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 3 group practices
- Deaconess Illinois Specialty Clinic, Inc.Harrisburg, IL
- Select Physical Therapy Holdings IncWest Frankfort, IL
- Southern Orthopedic Associates SCCarbondale, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gretchen B. Mason among 4,926 physician assistant records in Illinois
Gretchen B. Mason, PA-C is one of 4,926 physician assistant records with a practice address in Illinois. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 98% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2005 · median 2019 among the 3,407 with a school on file
- Record last updated2009 · 35% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 physician assistant records list a practice address in Herrin
They are 28 of the 419 NPPES records with a practice address in Herrin, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Herrin → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Anna Anderson, PA-CHerrin, IL 629481396859328
- Angela Arnold, PACHerrin, IL 629481780790386
- Michele Behm, PA-CHerrin, IL 629481841307014
- Scott Cranick, PA-CHerrin, IL 629481902992050
- Darrell Cutler, PACHerrin, IL 629481477668093
- Phillip Erthall, PACHerrin, IL 629481255446886
- Robin Gallo, PA-CHerrin, IL 629481497869440
- Leon Gauthier, PA-CHerrin, IL 629481033145172
Common questions
What is Gretchen B. Mason, PA-C's NPI number?
Gretchen B. Mason, PA-C's National Provider Identifier (NPI) is 1245229111, issued on Oct 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gretchen B. Mason, PA-C located?
The NPPES record lists a practice address at 510 Lincoln Dr, Herrin, IL, 62948. Phone: (618) 997-6800. Providers update this record themselves, so call before visiting.
How can I verify Gretchen B. Mason, PA-C's license?
NPPES lists Illinois license number 0850003442, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Gretchen B. Mason, PA-C prescribe under Medicare Part D?
In 2024, Gretchen B. Mason, PA-C had 125 Medicare Part D claims for 66 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Gretchen B. Mason, PA-C's MIPS final score?
The 2023 MIPS final score is 86.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.