Dr. Alexander Gayle Parker, MD
- Medicare services, 2024
- 172
- Medicare patients, 2024
- 161
- Part D claims, 2024
- 150
- Hospital affiliations
- 1
- Industry payments
- $80
- Practice address
- 1400 Us-61, Festus, MO 63028
- Practice phone
- Call (636) 933-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mercy Hospital Jefferson
Festus, Missouri
Find Dr. Parker'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.
Dr. Alexander Gayle Parker is an emergency medicine physician in Festus, Missouri
Dr. Parker practices at Mercy Hospital Jefferson in Festus, Missouri.
Dr. Parker's NPI, 1689177743, was assigned on March 15, 2018. Dr. Parker holds Missouri license 2021047265.
- NPI
- 1689177743NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1557785995
- NPI enumeration date
- March 15, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (636) 933-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Alexander Gayle Parker practices at Mercy Hospital Jefferson in Festus, Missouri
Dr. Parker's primary practice is Mercy Hospital Jefferson, at 1400 Us-61, Festus, MO 63028 in Jefferson County. The practice phone is (636) 933-1000.
- Mercy Hospital Jefferson1400 Us-61, Festus, MO 63028 · Jefferson CountyPhone(636) 933-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Alexander Gayle Parker is affiliated with 4 sites of care and 5 medical groups
Dr. Parker's primary practice is Mercy Hospital Jefferson in Festus, Missouri. Dr. Parker is also affiliated with Mercy Hospital Jefferson. The medical group on file is Mercy Hospital Jefferson. Dmand AI also links Dr. Parker to 4 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Alexander Gayle Parker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Parker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Hospital Jefferson | Available with a free account |
| +3 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Alexander Gayle Parker is one of 1,063 emergency medicine physicians in Missouri
Emergency medicine is Dr. Parker's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Parker is licensed in Missouri.
Specialties and state licenses
- Emergency medicine, MissouriPrimary
Emergency medicine physicians near Dr. Parker
Counts of emergency medicine physicians 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. Alexander Gayle Parker billed Medicare for 172 services in 2024
CMS data shows 172 Medicare services from Dr. Parker across 3 procedure codes in 2024, for 161 Medicare patients. Medicare paid $23,004 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Parker compared with the Missouri median for emergency medicine physicians, 2024
- Dr. Parker
- Missouri median
- Medicare services
- 172vs 25232% below
- Medicare patients
- 161vs 26239% below
- Part D claims
- 49vs 6929% below
Medians across 1,092 emergency medicine physicians in Missouri with Dmand AI profiles that report each measure.
Dr. Parker's 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. Parker and other emergency medicine physicians in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Alexander Gayle Parker treated 161 Medicare patients in 2024, average age 71
CMS counts 161 Medicare patients who saw Dr. Parker in 2024. The largest group is 75 to 84, with 50 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 2.52, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Parker's median patient age at 67, with 53% women.
Dr. Parker's Medicare patients by age, 2024
Dr. Parker's Medicare patients by sex, 2024
- Women9056%
- Men7144%
Chronic conditions among Dr. Parker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Anxiety55%
- Mood disorders54%
- Ischemic heart disease52%
- Depression51%
- Diabetes48%
Share of Medicare patients with each condition. A patient can have several.
Dr. Parker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Alexander Gayle Parker wrote 150 Medicare Part D claims in 2024
In 2024, Dr. Parker wrote 150 Medicare Part D claims for 103 patients. 93% of them were for generic drugs. CMS names the drug for 49 of them, across 3 drugs with 11 or more claims each, at $166 in total drug cost.
Dr. Parker's Part D claims by kind of drug, 2024
- Generic140 claims93%
- Brand-name and other10 claims7%
Dr. Parker's 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.
Drug classes CMS tracks in Dr. Parker's Part D claims, 2024
- Opioids19%29 of 150 claims
- Antibiotics37%56 of 150 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
How Dr. Alexander Gayle Parker takes part in Medicare
Dr. Parker 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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Dr. Alexander Gayle Parker received $80 in industry payments from 2023 to 2024
CMS Open Payments shows 3 general payments to Dr. Parker from 1 drug or device company from 2023 to 2024. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $80.
General payments to Dr. Parker by program year, 2023 to 2024
Companies that paid Dr. Parker the most, 2023 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Alexander Gayle Parker'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 DataDmand AI Org Hierarchy 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) |
| 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 Dr. Alexander Gayle Parker
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. Alexander Gayle Parker's NPI number?
Dr. Alexander Gayle Parker's NPI number is 1689177743. It was assigned on March 15, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Alexander Gayle Parker?
Dr. Alexander Gayle Parker is an emergency medicine physician in Festus, Missouri. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Alexander Gayle Parker practice?
Dr. Parker practices at 1400 Us-61, Festus, MO 63028. Dr. Parker's primary practice is Mercy Hospital Jefferson in Festus, Missouri. Dmand AI also links Dr. Parker to 4 medical groups and 2 group practices and clinics.
What is Dr. Alexander Gayle Parker's office phone number?
The practice phone on file for Dr. Parker is (636) 933-1000.
What is Dr. Alexander Gayle Parker's medical license number?
Dr. Parker holds Missouri license 2021047265.
Which hospitals is Dr. Alexander Gayle Parker affiliated with?
Dr. Parker is affiliated with Mercy Hospital Jefferson.
What medical group is Dr. Alexander Gayle Parker part of?
Dr. Parker is linked to Mercy Hospital Jefferson. Dmand AI links Dr. Parker to 4 more medical groups.
Does Dr. Alexander Gayle Parker accept Medicare?
Yes. CMS data shows Dr. Parker billed Medicare for 172 services in 2024, and Dr. Parker accepts Medicare assignment.
How many Medicare patients does Dr. Alexander Gayle Parker see?
CMS counts 161 Medicare patients who saw Dr. Parker in 2024, with an average age of 71.
What services does Dr. Alexander Gayle Parker bill to Medicare?
In 2024, Dr. Parker's most billed Medicare services were emergency department visit (99285), critical care (99291) and emergency department visit (99284).
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What drugs does Dr. Alexander Gayle Parker prescribe most?
In 2024 Medicare Part D data, Dr. Parker's most prescribed drugs by claims were Oxycodone HCl, Ondansetron ODT and Azithromycin.
Has Dr. Alexander Gayle Parker received payments from drug or device companies?
CMS Open Payments shows $80 in general payments to Dr. Parker from 1 company from 2023 to 2024. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Alexander Gayle Parker been practicing?
Dr. Parker graduated from medical school in 2020, 6 years ago.
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