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

DR. CHRISTOPHER SHERIDAN RYCKMAN M.D.
NPI 1912984105
Internal Medicine - Critical Care Medicine in Lancaster, OH

Active since December 28, 2005
110 N EWING ST, LANCASTER, OH 43130(740) 687-5864 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Dr. Christopher Sheridan Ryckman M.d. NPPES

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

DR. CHRISTOPHER SHERIDAN RYCKMAN M.D. (NPI 1912984105) is an individual critical care medicine provider in Lancaster, Ohio, licensed in Ohio (048474) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1912984105
Entity TypeIndividualMale
Primary Taxonomy207RC0200X
Provider Legal NameDR. CHRISTOPHER SHERIDAN RYCKMANCredential: M.D.
Location Address110 N EWING STLancaster, OH 43130-3307
Mailing Address110 N Ewing StLancaster, OH 43130-3307 · (740) 687-5864
Phone(740) 687-5864
Sole ProprietorNo
Enumeration DateDecember 28, 2005
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1912984105 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RC0200X
License✔ Licensed in OH · 048474
Definition
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X · License 048474 (OH)
110 N EWING ST, Lancaster, OH 43130
Open in Google Maps ↗

Other Identifiers 2

Other08991010OH · Bwc
Medicaid0628306OH

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHEST CONSULTANTS, INC.
Internal Medicine (Pulmonary Disease)
110 N EWING ST
LANCASTER, OH 43130
Fairfield County (740) 687-5864

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 Christopher Ryckman's NPI number?

The NPI number for Christopher Ryckman is 1912984105. It was assigned to this individual provider in the NPPES registry on December 28, 2005.

Where is Christopher Ryckman located?

Christopher Ryckman practices at 110 N Ewing St, Lancaster, OH 43130. The listed phone number is (740) 687-5864.

What is Christopher Ryckman's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

When was this NPI record last updated?

The NPPES record for Christopher Ryckman was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 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.