Gretchen B. Mason, PA-C
- Medicare patients, 2024
- 415
- Part D claims, 2024
- 125
- Hospital affiliations
- 2
- Industry payments
- $86
- Medical groups
- 3
- Practice address
- 510 Lincoln Drive, Herrin, IL 62948
- Practice phone
- Call (618) 997-6800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Southern Illinois Orthopedic Center
Surgery Center - Medicare-Certified · Herrin, Illinois
Find Gretchen Mason's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Gretchen B. Mason is a physician assistant in Herrin, Illinois
Gretchen Mason practices at Southern Illinois Orthopedic Center in Herrin, Illinois.
Gretchen Mason's NPI, 1245229111, was assigned on October 13, 2005. Gretchen Mason holds Illinois license 0850003442.
- NPI
- 1245229111NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5890728646
- NPI enumeration date
- October 13, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (618) 997-6800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gretchen B. Mason practices at Southern Illinois Orthopedic Center in Herrin, Illinois
Gretchen Mason's primary practice is Southern Illinois Orthopedic Center, at 510 Lincoln Drive, Herrin, IL 62948. The practice phone is (618) 997-6800.
- Southern Illinois Orthopedic Center510 Lincoln Drive, Herrin, IL 62948Phone(618) 997-6800
Source: Dmand AI Affiliation Data
Gretchen B. Mason is affiliated with 5 sites of care and 3 medical groups
Gretchen Mason's primary practice is Southern Illinois Orthopedic Center in Herrin, Illinois. Gretchen Mason is also affiliated with SIH Herrin Hospital. The medical group on file is Select Physical Therapy. Dmand AI also links Gretchen Mason to 1 more hospital, 2 group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Gretchen B. Mason's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gretchen Mason practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Southern Illinois Orthopedic Center | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Gretchen B. Mason is one of 4,299 physician assistants in Illinois
Physician assistant is Gretchen Mason's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Gretchen Mason is licensed in Illinois.
Specialties and state licenses
- Physician assistant, IllinoisPrimary
Physician assistants near Gretchen Mason
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Gretchen B. Mason treated 415 Medicare patients in 2024, average age 72
CMS counts 415 Medicare patients who saw Gretchen Mason in 2024. The largest group is 65 to 74, with 181 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 31% are also on Medicaid. Their average risk score is 3.05, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Gretchen Mason's median patient age at 68, with 62% women.
Gretchen Mason's Medicare patients by age, 2024
Gretchen Mason's Medicare patients by sex, 2024
- Women23055%
- Men18545%
Chronic conditions among Gretchen Mason's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Chronic kidney disease48%
- Diabetes48%
- Ischemic heart disease40%
- Anxiety35%
- COPD31%
Share of Medicare patients with each condition. A patient can have several.
Gretchen Mason's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women62%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Gretchen B. Mason wrote 125 Medicare Part D claims in 2024
In 2024, Gretchen Mason wrote 125 Medicare Part D claims for 66 patients. 92% of them were for generic drugs.
Gretchen Mason's Part D claims by kind of drug, 2024
- Generic115 claims92%
- Brand-name and other10 claims8%
Drug classes CMS tracks in Gretchen Mason's Part D claims, 2024
- Opioids20%25 of 125 claims
- Antibiotics13%16 of 125 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Gretchen B. Mason takes part in Medicare
Gretchen Mason accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Gretchen B. Mason received $86 in industry payments in 2025
CMS Open Payments shows 5 general payments to Gretchen Mason from 3 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Ferring Pharmaceuticals Inc. paid the most, $46.
Companies that paid Gretchen Mason the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Gretchen B. Mason's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Gretchen B. Mason
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Gretchen B. Mason's NPI number?
Gretchen B. Mason's NPI number is 1245229111. It was assigned on October 13, 2005, and it is active in the NPI Registry.
What does Gretchen B. Mason specialize in?
Gretchen B. Mason is a physician assistant in Herrin, Illinois. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Gretchen B. Mason practice?
Gretchen Mason practices at 510 Lincoln Drive, Herrin, IL 62948. Gretchen Mason's primary practice is Southern Illinois Orthopedic Center in Herrin, Illinois. Dmand AI also links Gretchen Mason to 1 hospital, 2 group practices and clinics and 2 medical groups.
What is Gretchen B. Mason's office phone number?
The practice phone on file for Gretchen Mason is (618) 997-6800.
What is Gretchen B. Mason's medical license number?
Gretchen Mason holds Illinois license 0850003442.
Which hospitals is Gretchen B. Mason affiliated with?
Gretchen Mason is affiliated with SIH Herrin Hospital. Dmand AI links Gretchen Mason to 1 more hospital.
What medical group is Gretchen B. Mason part of?
Gretchen Mason is linked to Select Physical Therapy. Dmand AI links Gretchen Mason to 2 more medical groups.
Does Gretchen B. Mason accept Medicare?
Yes. CMS lists Gretchen Mason as accepting Medicare assignment.
How many Medicare patients does Gretchen B. Mason see?
CMS counts 415 Medicare patients who saw Gretchen Mason in 2024, with an average age of 72.
Has Gretchen B. Mason received payments from drug or device companies?
CMS Open Payments shows $86 in general payments to Gretchen Mason from 3 companies from 2025 to 2025. The largest total came from Ferring Pharmaceuticals Inc.
How long has Gretchen B. Mason been practicing?
Gretchen Mason graduated from medical school in 2005, 21 years ago.
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