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DR. JOHN HOLLAND SADLER M.D.
NPI 1235100850
Internal Medicine - Nephrology in Baltimore, MD

Active since January 31, 2006
840 HOLLINS ST, BALTIMORE, MD 21201(410) 468-0900(410) 468-0911 Get Directions Write a Review

NPPES record last updated: October 5, 2010. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Dr. John Holland Sadler M.d. NPPES

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

DR. JOHN HOLLAND SADLER M.D. (NPI 1235100850) is an individual nephrology provider in Baltimore, Maryland, licensed in Maryland (D14336) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1235100850
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameDR. JOHN HOLLAND SADLERCredential: M.D.
Location Address840 HOLLINS STBaltimore, MD 21201-1024
Mailing Address840 Hollins StBaltimore, MD 21201-1024 · (410) 468-0900 · Fax (410) 468-0911
Phone(410) 468-0900
Fax(410) 468-0911
Sole ProprietorYes
Enumeration DateJanuary 31, 2006
Last NPPES UpdateOctober 5, 2010
✔ NPI 1235100850 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in MD · D14336
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
840 HOLLINS ST, Baltimore, MD 21201
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Other Identifiers 3

MedicaidMA-15001-1200MD
OtherD14336MD · State License
Medicare UPIND75327MD

Other Providers at the Same Location NPPES 6

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

MICHELLE CAROLINE VALLANDINGHAM RN, CDN
Registered Nurse
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (410) 328-6305
INDEPENDENT DIALYSIS FOUNDATION
Clinic/Center (End-Stage Renal Disease (ESRD) Treatment)
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (410) 468-0900
UNIVERSITY OF MARYLAND SURGICAL ASSOCIATES, PA
Surgery
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (667) 214-1718
UNIVERSITY OF MARYLAND SURGICAL ASSOCIATES, PA
Transplant Surgery
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (667) 214-1718
INDEPENDENT DIALYSIS FOUNDATION, INC
Clinic/Center (End-Stage Renal Disease (ESRD) Treatment)
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (410) 468-0900
UNIVERSITY OF MARYLAND PHYSICIANS P.A.
Internal Medicine (Nephrology)
840 HOLLINS ST
BALTIMORE, MD 21201
Baltimore City (410) 468-0900

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 John Sadler's NPI number?

The NPI number for John Sadler is 1235100850. It was assigned to this individual provider in the NPPES registry on January 31, 2006.

Where is John Sadler located?

John Sadler practices at 840 Hollins St, Baltimore, MD 21201. The listed phone number is (410) 468-0900.

What is John Sadler's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

When was this NPI record last updated?

The NPPES record for John Sadler was last updated on October 5, 2010. NPI Profile syncs with the weekly NPPES data releases published by CMS.