Nicholas Callahan, DO

Nicholas Callahan, DO is an orthopaedic surgery physician practicing in Mayfield Heights, OH. The NPI was issued on May 21, 2014, and the record was last updated in NPPES on July 28, 2026. One additional practice location is listed.

Taxonomies and licenses

Practice locations

Local context

Active NPPES records list 257 providers with orthopaedic surgery physician as the primary taxonomy within 25 miles of this practice location's ZIP code, 89 of them within 10 miles.

The same primary taxonomy is listed by 1,296 in Ohio and 36,925 nationwide.

These are counts from NPPES records, not a ranking or recommendation. Distances are measured between ZIP code centers, not street addresses.

Other providers at this address

• John Horinger, M.D. (Internal Medicine Physician)
• Louis Keppler, MD (Orthopaedic Surgery Physician)
• Mark Grubb, MD (Orthopaedic Surgery Physician)
• Richard Tomm, M.D. (Internal Medicine Physician)

Providers whose NPPES practice location has the same street address, listing those with a page here.

Nearby providers with the same primary taxonomy

• Louis Keppler, MD , Mayfield Heights, OH, same ZIP code
• Mark Grubb, MD , Cleveland, OH, same ZIP code
• Jeffrey Shall, MD , Warrensville Heights, OH, about 6 miles
• Alexander Hallwachs, MD , Cleveland, OH, about 7 miles
• Eric Milliron , Cleveland, OH, about 7 miles
• Marsalis Brown, MD , Cleveland, OH, about 7 miles
• Nolan Farrell, MD , Cleveland, OH, about 7 miles
• John Krebs, MD , Chardon, OH, about 15 miles

Record history

Name on record

Dr. Nicholas Knoble Callahan

Status

Active

NPI issued

May 21, 2014

Last updated in NPPES

July 28, 2026

Is this your record? Updates are made through NPPES, the official National Plan and Provider Enumeration System.

NPPES data as of September 13, 2026 · Source: CMS NPPES

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.npilayer.com/v1/providers/1659783934"