Grant Michael Barnum, D.O.
Geriatric Medicine (Internal Medicine) Physician · Lake Ozark, MO
Grant Michael Barnum, D.O. is a geriatric medicine (internal medicine) physician with a practice address in Lake Ozark, Missouri, and NPI 1639178445, issued on Jul 14, 2005. Check the license (Missouri DOR4GO2, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Grant Michael Barnum
- Credential
- D.O.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- DOR4GO2 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1870 Bagnell Dam Blvd, Lake Ozark, MO 65049
- Phone
- (573) 365-2318
- Enumerated
- Jul 14, 2005
- Record last updated
- May 5, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (573) 365-3009
- Medicaid ID
- 242978211 MO
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 75 in Missouri → Look up another NPI →
Also registered at 1870 Bagnell Dam Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dennis Albers, RPH, MBAPharmacist1205067477
- Debra Atkinson, MDFamily Medicine Physician1376515080
- Colleen Cueni-Smith, P.T.Physical Therapist1043460322
- Alicia GoodhartFamily Nurse Practitioner1497321723
- Karen Hayes, N.P.Family Nurse Practitioner1003812918
- Joan Kelley, FNPFamily Nurse Practitioner1881604585
Verify Grant Michael Barnum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license DOR4GO2Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
97 Medicare Part D claims, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Risperidone26 claims
- Atorvastatin Calcium13 claims
- Gabapentin13 claims
- Omega-3 Acid Ethyl Esters13 claims
- Omeprazole13 claims
- Tamsulosin Hcl13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Grant Michael Barnum among 75 geriatric medicine (internal medicine) physician records in Missouri
Grant Michael Barnum, D.O. is one of 75 geriatric medicine (internal medicine) physician records with a practice address in Missouri. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 45% of these records are
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Missouri
There are 75 geriatric medicine (internal medicine) physician records in Missouri.
All 75 in Missouri → Every provider in Lake Ozark → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- David Fleming, MDColumbia, MO 652031073565024
- Anne Egbert, M.D.Springfield, MO 658031033197553
- Maria Dela Rosa, MDSpringfield, MO 658041114069168
- Nabil Kamel, M.D.Springfield, MO 658071326080276
- Lance Luria, MDSpringfield, MO 658071285777698
- Jon Dedon, M.D.Kansas City, MO 641391528036613
- Ahmad Batrash, M.D.Kansas City, MO 641281720009277
- Kathleen Sproules, D.O.Kansas City, MO 641141629187992
Common questions
What is Grant Michael Barnum, D.O.'s NPI number?
Grant Michael Barnum, D.O.'s National Provider Identifier (NPI) is 1639178445, issued on Jul 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Grant Michael Barnum, D.O. located?
The NPPES record lists a practice address at 1870 Bagnell Dam Blvd, Lake Ozark, MO, 65049. Phone: (573) 365-2318. Providers update this record themselves, so call before visiting.
How can I verify Grant Michael Barnum, D.O.'s license?
NPPES lists Missouri license number DOR4GO2, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Grant Michael Barnum, D.O. prescribe under Medicare Part D?
In 2024, Grant Michael Barnum, D.O. had 97 Medicare Part D claims; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.