Frederick Joseph Nachtwey, M.D.

NPI 1710901822ActiveIndividual· Internal Medicine, Pulmonary Disease· Walnut Creek, CA

Internal Medicine, Pulmonary Disease (M.D.) in Walnut Creek, California, trained at Washington University School of Medicine (class of 1974). Their prescriptions cost Medicare Part D more than their services did: $797,438 for 1,494 claims, against $109,162 paid for services in 2024. Inspire Medical Systems, Inc. reported $106.35 in payments in 2025, mostly food and beverage.

Overview

NPI	1710901822
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	Yes
NPI issued	Jul 26, 2006
Last updated in NPPES	Mar 3, 2025
Certified by provider	Mar 3, 2025

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Pulmonary Disease Primary	207RP1001X	G35274	CA
Internal Medicine, Sleep Medicine	207RS0012X	G35274	CA

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026	No match	—
New York OMIG · Nov 10, 2026	No match	—
Ohio Medicaid · Nov 10, 2026	No match	—
Pennsylvania Medicheck · Nov 10, 2026	No match	—
Washington HCA · Nov 10, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Pulmonary Disease (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	493
Services billed	970 across 16 procedure codes
Paid by Medicare	$109,162

Part D prescriptions in 2024

Prescriptions (claims)	1,494 · 2,032 30-day fills
Patients	229
Total drug cost	$797,438
Generic share	55% of claims

Medicare sources and data years

Education and affiliations

Medical school	Washington University School of Medicine
Graduation year	1974
Medicare specialty	Pulmonary Disease
Secondary specialties	Internal Medicine, Sleep Medicine