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John Sadler, M.D.
NPI 1235100850 · Nephrology Physician · Baltimore, MD
John Sadler, M.D. is a Nephrology Physician provider in Baltimore, MD (NPI 1235100850).
Provider details
- NPI number
- 1235100850
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- D14336 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
840 Hollins St
Baltimore, MD 21201-1024
Phone: (410) 468-0900
Fax: (410) 468-0911
Street-level locationGet directions
Mailing address
840 Hollins St
Baltimore, MD 21201-1024
Registry dates
- Enumerated
- 2006-01-31
- Last updated
- 2010-10-05
Frequently asked questions
- What is John Sadler's NPI number?
- John Sadler's National Provider Identifier (NPI) is 1235100850, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Sadler's specialty?
- John Sadler is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is John Sadler located?
- John Sadler's practice location on file with NPPES is 840 Hollins St, Baltimore, MD 21201-1024.
- What is John Sadler's phone number?
- The practice phone number listed in the NPPES registry for John Sadler is (410) 468-0900.
- Is John Sadler's NPI active?
- Yes — John Sadler's NPI (1235100850) is active in the NPPES registry as of the last update on 2010-10-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.