John Mark Irby, FNP
Family Nurse Practitioner · McComb, MS
John Mark Irby, FNP is a family nurse practitioner with a practice address in McComb, Mississippi, and NPI 1962968040, issued on Feb 14, 2019. Check the license (Mississippi 903116, as entered in NPPES) with the Mississippi board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Mark Irby
- Credential
- FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 903116 MS
Self-reported in NPPES; status is on the state search - Practice location
- 215 Marion Ave, McComb, MS 39648
- Phone
- (601) 249-5500
- Enumerated
- Feb 14, 2019
- Record last updated
- Jan 22, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (601) 249-1173
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 3,798 in Mississippi → Look up another NPI →
Also registered at 215 Marion Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Mark Irby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Mississippi board licenses this profession
Search for license 903116Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average family nurse practitioner in 2024
338 Medicare Part D claims for 206 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 62 claims were for opioids.
Most prescribed
- Cyclobenzaprine Hcl43 claims
- Diclofenac Sodium42 claims
- Hydrocodone-Acetaminophen38 claims
- Amoxicillin-Clavulanate Potass31 claims
- Nitrofurantoin Mono-Macro21 claims
- Ondansetron Odt21 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.
Industry payments in 2024: $57.13
2 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John Mark Irby among 3,798 family nurse practitioner records in Mississippi
John Mark Irby, FNP is one of 3,798 family nurse practitioner records with a practice address in Mississippi. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 62% of them.
- NPI issued2019 · 62% of these records are older, 32% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2020 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Mississippi practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 family nurse practitioner records list a practice address in McComb
They are 45 of the 644 NPPES records with a practice address in McComb, and 3,798 family nurse practitioner records in Mississippi.
All 3,798 in Mississippi → Every provider in McComb → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- William Bass, N.P.McComb, MS 396481073920716
- Jackie Brister, F.N.P.McComb, MS 396481568473270
- Llewellyn Coon, CNFPMcComb, MS 396481962451302
- Jennifer Edwards, FNPMcComb, MS 396481790019354
- Kathryn GinnMcComb, MS 396481518009943
- Jordan Harrington, N.P.McComb, MS 396481548600612
- John Harvey, FNP-CMcComb, MS 396481982012548
- Terrilyn Lewis, NP-C, MSNMcComb, MS 396481881797330
Common questions
What is John Mark Irby, FNP's NPI number?
John Mark Irby, FNP's National Provider Identifier (NPI) is 1962968040, issued on Feb 14, 2019. An NPI identifies a provider in billing; it is not a license.
Where is John Mark Irby, FNP located?
The NPPES record lists a practice address at 215 Marion Ave, McComb, MS, 39648. Phone: (601) 249-5500. Providers update this record themselves, so call before visiting.
How can I verify John Mark Irby, FNP's license?
NPPES lists Mississippi license number 903116, as entered by the provider. Search the Mississippi board that licenses this profession; the NPPES record confirms identity only.
How much does John Mark Irby, FNP prescribe under Medicare Part D?
In 2024, John Mark Irby, FNP had 338 Medicare Part D claims for 206 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.