Dr. Christopher Barclay Hamm, MD
- Medicare services, 2024
- 1,983
- Medicare patients, 2024
- 468
- Part D claims, 2024
- 17,650
- Publications
- 2
- Hospital affiliations
- 6
- 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. Hamm's professional email, personal email and mobile number
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Dr. Christopher Barclay Hamm is an internist in Saint Louis, Missouri
Dr. Hamm practices at Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy.
Dr. Hamm's NPI, 1730490830, was assigned on June 23, 2010. Dr. Hamm holds Missouri license 2010019752.
- NPI
- 1730490830NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294969267
- NPI enumeration date
- June 23, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (314) 251-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christopher Barclay Hamm practices at Mercy Hospital St. Louis in Saint Louis, Missouri
Dr. Hamm'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. Christopher Barclay Hamm is affiliated with 10 sites of care and 2 medical groups
Dr. Hamm's primary practice is Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy. Dr. Hamm is also affiliated with Missouri Baptist Medical Center. The medical group on file is Mercy Clinic East Communities. Dmand AI also links Dr. Hamm to 4 more hospitals, 2 group practices and clinics, 1 home health agency, 1 hospice 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. Christopher Barclay Hamm's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamm practices, 10 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 |
| +9 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Christopher Barclay Hamm is one of 2,114 internists in Missouri
Internal medicine is Dr. Hamm's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Hamm is licensed in Missouri.
Specialties and state licenses
- Internal medicine, MissouriPrimary
Internists near Dr. Hamm
Counts of internists 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. Christopher Barclay Hamm billed Medicare for 1,983 services in 2024
CMS data shows 1,983 Medicare services from Dr. Hamm across 16 procedure codes in 2024, for 468 Medicare patients. Medicare paid $154,084 for them. Every service was in an office.
Dr. Hamm's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9702024: 8799%
- Other services
- 2023: 5232024: 86265%
- Tests and treatments
- 2023: 2322024: 231No change
- Lab and pathology
- 2023: 02024: 11
Dr. Hamm compared with the Missouri median for internists, 2024
- Dr. Hamm
- Missouri median
- Medicare services
- 1,983vs 5303.7 times
- Medicare patients
- 468vs 2112.2 times
- Part D claims
- 16,777vs 32551.6 times
Medians across 2,076 internists in Missouri with Dmand AI profiles that report each measure.
Dr. Hamm'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.
Need commercial claims for Dr. Hamm?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hamm and other internists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher Barclay Hamm treated 468 Medicare patients in 2024, average age 74
CMS counts 468 Medicare patients who saw Dr. Hamm in 2024. The largest group is 65 to 74, with 221 patients. 75% of them have high cholesterol, and 64% have high blood pressure. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Hamm's median patient age at 70, with 49% women.
Dr. Hamm's Medicare patients by age, 2024
Dr. Hamm's Medicare patients by sex, 2024
- Women21947%
- Men24953%
Chronic conditions among Dr. Hamm's Medicare patients, 2024
- High cholesterol75%
- High blood pressure64%
- Arthritis44%
- Chronic kidney disease29%
- Anxiety27%
- Diabetes24%
- Mood disorders23%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hamm's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher Barclay Hamm wrote 17,650 Medicare Part D claims in 2024
In 2024, Dr. Hamm wrote 17,650 Medicare Part D claims for 1,137 patients. 88% of them were for generic drugs. CMS names the drug for 16,777 of them, across 194 drugs with 11 or more claims each, at $1,502,164 in total drug cost. In 2023, CMS named 15,619 claims across 184 drugs.
Dr. Hamm's Part D claims by kind of drug, 2024
- Generic15,528 claims88%
- Brand-name2,041 claims12%
- Other81 claims0%
Dr. Hamm'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. Hamm's Part D claims, 2024
- Opioids5%920 of 17,650 claims
- Antibiotics2%271 of 17,650 claims
- Antipsychotics, patients 65 and over0%70 of 17,650 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 15,6192024: 16,7777%
Drugs named by CMS: 194 in 2024, 184 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
Dr. Christopher Barclay Hamm offers telehealth to Medicare patients
Dr. Hamm accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hamm as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Christopher Barclay Hamm has 2 publications on record
Dmand AI links 2 papers to Dr. Hamm, published from 2012 to 2014.
Recent publications by Dr. Hamm
See who Dr. Hamm researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hamm works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Christopher Barclay Hamm received $328 in industry payments from 2022 to 2025
CMS Open Payments shows 13 general payments to Dr. Hamm from 7 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 64% of the total. Mannkind Corporation paid the most, $119.
General payments to Dr. Hamm by program year, 2022 to 2025
General payments to Dr. Hamm by kind, 2022 to 2025
- Food and beverage$20964%
- Gifts$11936%
Companies that paid Dr. Hamm the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Christopher Barclay Hamm'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Christopher Barclay Hamm
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. Christopher Barclay Hamm's NPI number?
Dr. Christopher Barclay Hamm's NPI number is 1730490830. It was assigned on June 23, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher Barclay Hamm?
Dr. Christopher Barclay Hamm is an internist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Christopher Barclay Hamm practice?
Dr. Hamm practices at 615 New Ballas Road, Saint Louis, MO 63141. Dr. Hamm's primary practice is Mercy Hospital St. Louis in Saint Louis, Missouri, part of Mercy. Dmand AI also links Dr. Hamm to 4 hospitals, 2 group practices and clinics, 1 home health agency, 1 hospice and 1 medical group.
What is Dr. Christopher Barclay Hamm's office phone number?
The practice phone on file for Dr. Hamm is (314) 251-6000.
What is Dr. Christopher Barclay Hamm's medical license number?
Dr. Hamm holds Missouri license 2010019752.
Which hospitals is Dr. Christopher Barclay Hamm affiliated with?
Dr. Hamm practices at Mercy Hospital St. Louis in Saint Louis, Missouri. Dr. Hamm is also affiliated with Missouri Baptist Medical Center. Dmand AI links Dr. Hamm to 4 more hospitals.
What medical group is Dr. Christopher Barclay Hamm part of?
Dr. Hamm is linked to Mercy Clinic East Communities. Dmand AI links Dr. Hamm to 1 more medical group.
Does Dr. Christopher Barclay Hamm accept Medicare?
Yes. CMS data shows Dr. Hamm billed Medicare for 1,983 services in 2024, and Dr. Hamm accepts Medicare assignment.
Does Dr. Christopher Barclay Hamm offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Hamm as offering telehealth services.
How many Medicare patients does Dr. Christopher Barclay Hamm see?
CMS counts 468 Medicare patients who saw Dr. Hamm in 2024, with an average age of 74.
Show 5 more questionsShow fewer questions
What services does Dr. Christopher Barclay Hamm bill to Medicare?
In 2024, Dr. Hamm's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and medicare service (G2211).
What drugs does Dr. Christopher Barclay Hamm prescribe most?
In 2024 Medicare Part D data, Dr. Hamm's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Levothyroxine Sodium.
Has Dr. Christopher Barclay Hamm received payments from drug or device companies?
CMS Open Payments shows $328 in general payments to Dr. Hamm from 7 companies from 2022 to 2025. The largest total came from Mannkind Corporation.
How long has Dr. Christopher Barclay Hamm been practicing?
Dr. Hamm graduated from medical school in 2010, 16 years ago.
Does Dr. Christopher Barclay Hamm do research?
Dmand AI links 2 publications to Dr. Hamm, published from 2012 to 2014.
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