Dr. Mason F. Bias, MD
- Medicare services, 2024
- 477
- Medicare patients, 2024
- 131
- Part D claims, 2024
- 722
- Industry payments
- $9,252
- Affiliated sites
- 1
- Practice address
- 1815 Clarkson Rd, Chesterfield, MO 63017
- Practice phone
- Call (636) 728-0111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mid- America Surgery Center, LLC
Chesterfield, Missouri
Find Dr. Bias' 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.
Dr. Mason F. Bias is an ophthalmologist in Chesterfield, Missouri
Dr. Bias practices at Mid- America Surgery Center, LLC in Chesterfield, Missouri.
Dr. Bias' NPI, 1912982794, was assigned on December 14, 2005. Dr. Bias graduated from Vanderbilt University School of Medicine in 1993. Dr. Bias holds Missouri license 2001001461.
- NPI
- 1912982794NPI Registry (opens in a new tab)
- NPI enumeration date
- December 14, 2005
- NPI status
- Active
- Practice phone
- (636) 728-0111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Mason F. Bias practices at Mid- America Surgery Center, LLC in Chesterfield, Missouri
Dr. Bias' primary practice is Mid- America Surgery Center, LLC, at 1815 Clarkson Rd, Chesterfield, MO 63017 in Saint Louis County. The practice phone is (636) 728-0111.
- Mid- America Surgery Center, LLC1815 Clarkson Rd, Chesterfield, MO 63017 · Saint Louis CountyPhone(636) 728-0111
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mason F. Bias is affiliated with 2 sites of care
Dr. Bias' primary practice is Mid- America Surgery Center, LLC in Chesterfield, Missouri. Dmand AI also links Dr. Bias to 1 physician office, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mason F. Bias' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Bias practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mid- America Surgery Center, LLC | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mason F. Bias is one of 270 ophthalmologists in Missouri
Ophthalmology is Dr. Bias' primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Bias is licensed in Missouri.
Specialties and state licenses
- Ophthalmology, MissouriPrimary
Ophthalmologists near Dr. Bias
Counts of ophthalmologists 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
Dr. Mason F. Bias billed Medicare for 477 services in 2024
CMS data shows 477 Medicare services from Dr. Bias across 6 procedure codes in 2024, for 131 Medicare patients. Medicare paid $64,849 for them.
Dr. Bias' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 3472024: 17051%
- Office and hospital visits
- 2023: 3452024: 16353%
- Tests and treatments
- 2023: 2712024: 14447%
Where Dr. Bias' Medicare services took place, 2024
- In an office35174%
- In a facility12626%
Dr. Bias compared with the Missouri median for ophthalmologists, 2024
- Dr. Bias
- Missouri median
- Medicare services
- 477vs 1,58270% below
- Medicare patients
- 131vs 63079% below
- Part D claims
- 699vs 703Close to median
Medians across 286 ophthalmologists in Missouri with Dmand AI profiles that report each measure.
Dr. Bias' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Bias and other ophthalmologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mason F. Bias treated 131 Medicare patients in 2024, average age 75
CMS counts 131 Medicare patients who saw Dr. Bias in 2024. The largest group is 65 to 74, with 69 patients. 75% of them have high cholesterol, and 69% have high blood pressure. Their average risk score is 0.76, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Bias' median patient age at 74, with 53% women.
Dr. Bias' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Bias' Medicare patients by sex, 2024
- Women7456%
- Men5744%
Chronic conditions among Dr. Bias' Medicare patients, 2024
- High cholesterol75%
- High blood pressure69%
- Arthritis41%
- Chronic kidney disease21%
- Osteoporosis18%
- Atrial fibrillation16%
- Diabetes16%
- Ischemic heart disease16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Bias' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mason F. Bias wrote 722 Medicare Part D claims in 2024
In 2024, Dr. Bias wrote 722 Medicare Part D claims for 172 patients. 44% of them were for generic drugs. CMS names the drug for 699 of them, across 6 drugs with 11 or more claims each, at $43,502 in total drug cost. In 2023, CMS named 1,027 claims across 9 drugs.
Dr. Bias' Part D claims by kind of drug, 2024
- Generic319 claims44%
- Brand-name403 claims56%
Dr. Bias' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,0272024: 69932%
Drugs named by CMS: 6 in 2024, 9 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Mason F. Bias received $9,252 in industry payments from 2016 to 2024
CMS Open Payments shows 218 general payments to Dr. Bias from 17 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $4,772.
General payments to Dr. Bias by program year, 2016 to 2024
General payments to Dr. Bias by kind, 2016 to 2024
- Food and beverage$9,232100%
- Gifts$190%
Companies that paid Dr. Bias the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mason F. Bias graduated from Vanderbilt University School of Medicine
Dr. Bias graduated from Vanderbilt University School of Medicine in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mason F. Bias'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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 and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Dr. Mason F. Bias
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mason F. Bias' NPI number?
Dr. Mason F. Bias' NPI number is 1912982794. It was assigned on December 14, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mason F. Bias?
Dr. Mason F. Bias is an ophthalmologist in Chesterfield, Missouri. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Mason F. Bias practice?
Dr. Bias practices at 1815 Clarkson Rd, Chesterfield, MO 63017. Dr. Bias' primary practice is Mid- America Surgery Center, LLC in Chesterfield, Missouri. Dmand AI also links Dr. Bias to 1 physician office.
What is Dr. Mason F. Bias' office phone number?
The practice phone on file for Dr. Bias is (636) 728-0111.
What is Dr. Mason F. Bias' medical license number?
Dr. Bias holds Missouri license 2001001461.
Does Dr. Mason F. Bias accept Medicare?
Yes. CMS data shows Dr. Bias billed Medicare for 477 services in 2024.
How many Medicare patients does Dr. Mason F. Bias see?
CMS counts 131 Medicare patients who saw Dr. Bias in 2024, with an average age of 75.
What services does Dr. Mason F. Bias bill to Medicare?
In 2024, Dr. Bias' most billed Medicare services were eye exam or test (92136), surgery: eye (66984) and office visit, established patient (99214).
Where did Dr. Mason F. Bias go to medical school?
Dr. Bias graduated from Vanderbilt University School of Medicine in 1993.
What drugs does Dr. Mason F. Bias prescribe most?
In 2024 Medicare Part D data, Dr. Bias' most prescribed drugs by claims were Prednisolone Acetate, Moxifloxacin and Prolensa.
Has Dr. Mason F. Bias received payments from drug or device companies?
CMS Open Payments shows $9,252 in general payments to Dr. Bias from 17 companies from 2016 to 2024. The largest total came from Alcon Laboratories Inc.
How long has Dr. Mason F. Bias been practicing?
Dr. Bias graduated from medical school in 1993, 33 years ago.
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