DONALD THEODORE MEHLHORN DO
NPI 1912584947
Internal Medicine in Naples, FL
About Donald Theodore Mehlhorn Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DONALD THEODORE MEHLHORN DO (NPI 1912584947) is an individual internal medicine provider in Naples, Florida, licensed in Florida (OS20951) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, is affiliated with Adventhealth Orlando, and maintains a secondary practice location in Lake Mary.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Donald Theodore Mehlhorn Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Donald Mehlhorn reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orlando, FL 32835
- Reassigned Medicare billing, Florida enrollment
- 119 clinicians in this Medicare group
Lake Mary, FL 32746
- Reassigned Medicare billing, Florida enrollment
- 214 clinicians in this Medicare group
Lake Mary, FL 32746
- Reassigned Medicare billing, Florida enrollment
- 329 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Adventhealth Orlando
Acute Care Hospitals · Orlando, FLPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 34102 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NAPLES, FL 34102
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 Donald Mehlhorn's NPI number?
The NPI number for Donald Mehlhorn is 1912584947. It was assigned to this individual provider in the NPPES registry on March 25, 2021.
Where is Donald Mehlhorn located?
Donald Mehlhorn practices at 350 7th St N, Naples, FL 34102. The listed phone number is (239) 624-5000.
What is Donald Mehlhorn's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Donald Mehlhorn enrolled in Medicare?
Yes. Donald Mehlhorn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Donald Mehlhorn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Donald Mehlhorn reassigns Medicare benefits to 3 organizations: Orlando Inpatient Medicine, PA (Orlando, FL), Inpatient Care Specialists LLC (Lake Mary, FL) and Central Florida Inpatient Medicine LLC (Lake Mary, FL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Donald Mehlhorn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Donald Mehlhorn affiliated with any hospitals?
According to CMS data, Donald Mehlhorn is affiliated with Adventhealth Orlando.
When was this NPI record last updated?
The NPPES record for Donald Mehlhorn was last updated on May 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months 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.
# Donald Theodore Mehlhorn, DO · NPI 1912584947
Internal Medicine physician in Naples, Florida. Individual provider, active in the CMS NPPES registry since March 25, 2021.
## Identity
- **NPI:** 1912584947 (Entity type: Individual)
- **Enumerated:** March 25, 2021
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** OS20951 (Florida)
- **Sole proprietor:** No
## Practice location
- **Address:** 350 7TH ST N, Naples, FL 34102-5754
- **Phone:** (239) 624-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Orlando Inpatient Medicine, PA (NPI 1902287899, Orlando, FL); Inpatient Care Specialists LLC (NPI 1679817134, Lake Mary, FL); Central Florida Inpatient Medicine LLC (NPI 1649228859, Lake Mary, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Lake Erie College Of Osteopathic Medicine, Erie, class of 2021
## Record status
- **NPPES last updated:** May 22, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1912584947) · Data from the CMS NPPES public registry.