Dr. Zachary Keller, MD
- Medicare services, 2023
- 14
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 101
- Hospital affiliations
- 3
- Industry payments
- $1,836
- Practice address
- 615 New Ballas Road, Saint Louis, MO 63141
- Practice phone
- Call (314) 251-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Keller's professional email, personal email and mobile number
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Dr. Zachary Keller is an OB-GYN in Saint Louis, Missouri
Dr. Keller practices at Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy.
Dr. Keller's NPI, 1962865170, was assigned on April 4, 2016. Dr. Keller graduated from Saint Louis University School of Medicine in 2016. Dr. Keller holds Missouri license 2020023080.
- NPI
- 1962865170NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840582706
- NPI enumeration date
- April 4, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 251-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Zachary Keller practices at Mercy Hospital St. Louis in Saint Louis, Missouri
Dr. Keller's primary practice is Mercy Hospital St. Louis, at 615 New Ballas Road, Saint Louis, MO 63141 in St. Louis County. The practice phone is (314) 251-6000.
- Mercy Hospital St. Louis615 New Ballas Road, Saint Louis, MO 63141 · St. Louis CountyPhone(314) 251-6000
Source: Dmand AI Affiliation Data
Dr. Zachary Keller is affiliated with 4 sites of care and 2 medical groups
Dr. Keller's primary practice is Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy. Dr. Keller is also affiliated with Mercy Hospital South. The medical group on file is Mercy Clinic East Communities. Dmand AI also links Dr. Keller to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Zachary Keller's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Keller practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Hospital St. Louis | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Zachary Keller is one of 712 OB-GYNs in Missouri
Obstetrics and gynecology is Dr. Keller's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Keller is licensed in Missouri.
Specialties and state licenses
- Obstetrics and gynecology, MissouriPrimary
OB-GYNs near Dr. Keller
Counts of OB-GYNs 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. Zachary Keller billed Medicare for 14 services in 2023
CMS data shows 14 Medicare services from Dr. Keller across 1 procedure code in 2023, all of them office visits, for 18 Medicare patients. Medicare paid $929 for them. Every service was in an office.
Dr. Keller's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 02023: 14
- Other services
- 2022: 122023: 0100%
Dr. Keller compared with the Missouri median for OB-GYNs, 2023
- Dr. Keller
- Missouri median
- Medicare services
- 14vs 5374% below
- Medicare patients
- 18vs 4762% below
- Part D claims
- 26vs 4542% below
Medians across 650 OB-GYNs in Missouri with Dmand AI profiles that report each measure.
Dr. Keller's most billed Medicare procedure codes, 2023
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Zachary Keller treated 18 Medicare patients in 2024, average age 67
CMS counts 18 Medicare patients who saw Dr. Keller in 2024. The largest group is 85 and over, with 0 patients. 75% of them have high blood pressure, and 67% have high cholesterol. Their average risk score is 1.17, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Keller's median patient age at 41, with 99% women.
Dr. Keller's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Keller's Medicare patients, 2024
- High blood pressure75%
- High cholesterol67%
Share of Medicare patients with each condition. A patient can have several.
Dr. Keller's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 41
Patient panel by sex, all payers
- Women99%
- Men1%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Zachary Keller wrote 101 Medicare Part D claims in 2024
In 2024, Dr. Keller wrote 101 Medicare Part D claims for 20 patients. 79% of them were for generic drugs. CMS names the drug for 26 of them, across 2 drugs with 11 or more claims each, at $1,900 in total drug cost. In 2022, CMS named 13 claims across 1 drug.
Dr. Keller's Part D claims by kind of drug, 2024
- Generic80 claims79%
- Brand-name21 claims21%
Dr. Keller's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 132023: 26100%
Drugs named by CMS: 2 in 2023, 1 in 2022.
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. Zachary Keller takes part in Medicare
Dr. Keller 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. Zachary Keller received $1,836 in industry payments from 2020 to 2025
CMS Open Payments shows 94 general payments to Dr. Keller from 21 drug and device companies from 2020 to 2025. Food and beverage make up the largest share, 94% of the total. Mayne Pharma Inc. paid the most, $431.
General payments to Dr. Keller by program year, 2020 to 2025
General payments to Dr. Keller by kind, 2020 to 2025
- Food and beverage$1,72294%
- Education$1146%
Companies that paid Dr. Keller the most, 2020 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Zachary Keller graduated from Saint Louis University School of Medicine
Dr. Keller graduated from Saint Louis University School of Medicine in 2016.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Zachary Keller'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 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) |
| 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. Zachary Keller
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. Zachary Keller's NPI number?
Dr. Zachary Keller's NPI number is 1962865170. It was assigned on April 4, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Keller?
Dr. Zachary Keller is an OB-GYN in Saint Louis, Missouri. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Zachary Keller practice?
Dr. Keller practices at 615 New Ballas Road, Saint Louis, MO 63141. Dr. Keller's primary practice is Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy. Dmand AI also links Dr. Keller to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Zachary Keller's office phone number?
The practice phone on file for Dr. Keller is (314) 251-6000.
What is Dr. Zachary Keller's medical license number?
Dr. Keller holds Missouri license 2020023080.
Which hospitals is Dr. Zachary Keller affiliated with?
Dr. Keller practices at Mercy Hospital St. Louis in Saint Louis, Missouri. Dr. Keller is also affiliated with Mercy Hospital South. Dmand AI links Dr. Keller to 1 more hospital.
What medical group is Dr. Zachary Keller part of?
Dr. Keller is linked to Mercy Clinic East Communities. Dmand AI links Dr. Keller to 1 more medical group.
Does Dr. Zachary Keller accept Medicare?
Yes. CMS data shows Dr. Keller billed Medicare for 14 services in 2023, and Dr. Keller accepts Medicare assignment.
How many Medicare patients does Dr. Zachary Keller see?
CMS counts 18 Medicare patients who saw Dr. Keller in 2024, with an average age of 67.
What services does Dr. Zachary Keller bill to Medicare?
In 2023, Dr. Keller's most billed Medicare services were office visit, established patient (99213).
Show 4 more questionsShow fewer questions
Where did Dr. Zachary Keller go to medical school?
Dr. Keller graduated from Saint Louis University School of Medicine in 2016.
What drugs does Dr. Zachary Keller prescribe most?
In 2023 Medicare Part D data, Dr. Keller's most prescribed drugs by claims were Estradiol and Progesterone.
Has Dr. Zachary Keller received payments from drug or device companies?
CMS Open Payments shows $1,836 in general payments to Dr. Keller from 21 companies from 2020 to 2025. The largest total came from Mayne Pharma Inc.
How long has Dr. Zachary Keller been practicing?
Dr. Keller graduated from medical school in 2016, 10 years ago.
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