Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK RYAN MESSER PHARMD
NPI 1891567822
Pharmacist - Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Maineville, OH

Q: What is Mark Messer's NPI number?

The NPI number for Mark Messer is 1891567822. It was assigned to this individual provider in the NPPES registry on October 24, 2023.

Q: What is Mark Messer's specialty?

The primary specialty registered for this NPI is Pharmacist, specializing in Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist, with taxonomy code 1835P0018X.

Q: When was this NPI record last updated?

The NPPES record for Mark Messer was last updated on August 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since October 24, 2023

2900 W STATE HWY 22 & 3, MAINEVILLE, OH 45039(513) 683-4224(513) 677-6355 Get Directions Write a Review

NPPES record last updated: August 14, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Aug 14, 2026, Oct 24, 2023 (2 updates tracked since 2023).

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About Dr. Mark Ryan Messer Pharmd NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK RYAN MESSER PHARMD (NPI 1891567822) is an individual pharmacist clinician (phc)/ clinical pharmacy specialist in Maineville, Ohio, licensed in Ohio (3233027) and active in the NPI registry since October 2023.

NPPES Registry Identity

NPI1891567822

Entity TypeIndividualMale

Primary Taxonomy1835P0018X

Provider Legal NameDR. MARK RYAN MESSERCredential: PHARMD

Location Address2900 W STATE HWY 22 & 3Maineville, OH 45039

Mailing Address2900 W State Hwy 22 & 3Maineville, OH 45039 · (513) 683-4224 · Fax (513) 677-6355

Phone(513) 683-4224

Fax(513) 677-6355

Sole ProprietorNo

Enumeration DateOctober 24, 2023

Last NPPES UpdateAugust 14, 20262 updates tracked since enumeration

NPPES CertifiedAugust 14, 2026

✔ NPI 1891567822 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPharmacist · Pharmacist Clinician (PhC)/ Clinical Pharmacy SpecialistPharmacy Service Providers

Taxonomy Code1835P0018X

License✔ Licensed in OH · 3233027

Definition

Pharmacist Clinician/Clinical Pharmacy Specialist is a pharmacist with additional training and an expanded scope of practice that may include prescriptive authority, therapeutic management, and disease management.

2900 W STATE HWY 22 & 3, Maineville, OH 45039

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Messer's NPI number?

The NPI number for Mark Messer is 1891567822. It was assigned to this individual provider in the NPPES registry on October 24, 2023.

Where is Mark Messer located?

Mark Messer practices at 2900 W State Hwy 22 & 3, Maineville, OH 45039. The listed phone number is (513) 683-4224.

What is Mark Messer's specialty?

The primary specialty registered for this NPI is Pharmacist, specializing in Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist, with taxonomy code 1835P0018X.

When was this NPI record last updated?

The NPPES record for Mark Messer was last updated on August 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.