John Nelson Markham III, CRNA
- Medicare patients, 2024
- 60
- Industry payments
- $37
- Affiliated sites
- 3
- Medical groups
- 2
- State license
- 1
- Practice address
- 410 42nd Avenue North, Suite 300, Nashville, TN 37209
- Practice phone
- Call (615) 329-4401
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Oral Surgical Institute
Surgery Center - Medicare-Certified · Nashville, Tennessee
Find John Markham'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.
John Nelson Markham III is a nurse anesthetist in Nashville, Tennessee
John Markham practices at Oral Surgical Institute in Nashville, Tennessee.
John Markham's NPI, 1578032280, was assigned on November 26, 2018. John Markham holds Tennessee license 25313.
- NPI
- 1578032280NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1850630732
- NPI enumeration date
- November 26, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (615) 329-4401
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John Nelson Markham III practices at Oral Surgical Institute in Nashville, Tennessee
John Markham's primary practice is Oral Surgical Institute, at 410 42nd Avenue North, Suite 300, Nashville, TN 37209. The practice phone is (615) 329-4401.
- Oral Surgical Institute410 42nd Avenue North, Suite 300, Nashville, TN 37209Phone(615) 329-4401
Source: Dmand AI Affiliation Data
John Nelson Markham III is affiliated with 3 sites of care and 2 medical groups
John Markham's primary practice is Oral Surgical Institute in Nashville, Tennessee. The medical group on file is Anesthesia Medical Group. Dmand AI also links John Markham to 2 more group practices and clinics 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 John Nelson Markham III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Markham practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Oral Surgical Institute | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
John Nelson Markham III is one of 2,442 nurse anesthetists in Tennessee
Nurse anesthetist, certified registered is John Markham's primary specialty in the NPI Registry, under taxonomy code 367500000X. John Markham is licensed in Tennessee.
Specialties and state licenses
- Certified registered nurse anesthetist, TennesseePrimary
Nurse anesthetists near John Markham
Counts of nurse anesthetists 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
John Nelson Markham III treated 60 Medicare patients in 2024, average age 72
CMS counts 60 Medicare patients who saw John Markham in 2024. The largest group is 65 to 74, with 39 patients. 73% of them have high cholesterol, and 63% have high blood pressure. Their average risk score is 0.80, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Markham's median patient age at 64, with 57% women.
John Markham's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
John Markham's Medicare patients by sex, 2024
- Women3152%
- Men2948%
Chronic conditions among John Markham's Medicare patients, 2024
- High cholesterol73%
- High blood pressure63%
- Arthritis35%
- Diabetes25%
- Anxiety23%
- Chronic kidney disease22%
- Ischemic heart disease20%
Share of Medicare patients with each condition. A patient can have several.
John Markham's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women57%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How John Nelson Markham III takes part in Medicare
John Markham 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)
John Nelson Markham III received $37 in industry payments in 2025
CMS Open Payments shows 1 general payment to John Markham from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Micro-tech Endoscopy USA, Inc. paid the most, $37.
Companies that paid John Markham the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for John Nelson Markham III'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 patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - 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 John Nelson Markham III
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John Nelson Markham III's NPI number?
John Nelson Markham III's NPI number is 1578032280. It was assigned on November 26, 2018, and it is active in the NPI Registry.
What does John Nelson Markham III specialize in?
John Nelson Markham III is a nurse anesthetist in Nashville, Tennessee. The primary specialty in the NPI Registry is Certified Registered Nurse Anesthetist (taxonomy code 367500000X).
Where does John Nelson Markham III practice?
John Markham practices at 410 42nd Avenue North, Suite 300, Nashville, TN 37209. John Markham's primary practice is Oral Surgical Institute in Nashville, Tennessee. Dmand AI also links John Markham to 2 group practices and clinics and 1 medical group.
What is John Nelson Markham III's office phone number?
The practice phone on file for John Markham is (615) 329-4401.
What is John Nelson Markham III's medical license number?
John Markham holds Tennessee license 25313.
What medical group is John Nelson Markham III part of?
John Markham is linked to Anesthesia Medical Group. Dmand AI links John Markham to 1 more medical group.
Does John Nelson Markham III accept Medicare?
Yes. CMS lists John Markham as accepting Medicare assignment.
How many Medicare patients does John Nelson Markham III see?
CMS counts 60 Medicare patients who saw John Markham in 2024, with an average age of 72.
Has John Nelson Markham III received payments from drug or device companies?
CMS Open Payments shows $37 in general payments to John Markham from 1 company from 2025 to 2025. The largest total came from Micro-tech Endoscopy USA, Inc.
How long has John Nelson Markham III been practicing?
John Markham graduated from medical school in 2018, 8 years ago.
Selling to nurse anesthetist, certified registered practices?
See nurse anesthetists in Tennessee by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card