NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1225013493 M.D.
Verify on CMS → John Dalton, M.D.
Nephrology Physician in Catonsville, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,806 in Nephrology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
What the federal data shows
John Dalton, M.D. is a Nephrology Physician in Catonsville, Maryland, listed in the federal CMS National Provider Identifier registry.
- #72
- Nephrology Physician rank among Maryland specialties
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about John Dalton, M.D.
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1225013493), first enumerated 12/10/2005.
Source: CMS NPPES
- Not in federal data
Medicare Part D participation
No 2023 Medicare Part D prescribing volume appears in the CMS public file for this NPI (may reflect specialty, new enrollment, or non-prescribing role).
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1225013493 · Nephrology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1225013493
- ENUM-LEGACY 2005
- TAX-MID 11K Nephrology Physician
- RX-NONE No Part D
- BOOK-THIN 280 in Maryland
- PHOTO-ENUM Sundararaman Swamina… · 2005
◑
Board-eligible specialty (heuristic, not verified)
John Dalton, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about John Dalton, M.D.?
Quality data not reportedPrimary specialty
Nephrology Physician
Specialty distribution in Maryland
How Nephrology Physician compares to other specialties among Maryland providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Nephrology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1225013493 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/10/2005 |
Nephrology Physician Overview
How John Dalton, M.D. fits within the Nephrology Physician landscape nationally.
10,806
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,511
Avg Claims per Provider
Nationwide Nephrology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Dalton, both outside Maryland so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Nephrology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Dalton.
One of 280 Nephrology Physician providers enrolled in Maryland, 5 are shown here.
Dr. Hossam Abdalla
M.D.
Glen Burnie, MD
Marwa Abdalla
MBBS
Waldorf, MD
Dr. Veena Acharya
MD
Bel Air, MD
Dr. Rohini Adhikarla
M.D
Lutherville Timonium, MD
Dr. Muzna Adil
M.D.
Suitland, MD
Compare Nephrology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is John Dalton, M.D.'s specialty? ▼
John Dalton, M.D. specializes in Nephrology Physician and practices in Catonsville, Maryland. Credentials: M.D..
Where is John Dalton, M.D. located? ▼
John Dalton, M.D. is located at 2W ROLLING CROSSROADS, Catonsville, MD, 21228. Phone: (410) 788-8033.
What is John Dalton, M.D.'s NPI number? ▼
John Dalton, M.D.'s National Provider Identifier (NPI) is 1225013493, issued on 12/10/2005.
How many Nephrology Physician providers are there in the US? ▼
There are 10,806 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,511 Medicare Part D claims per year.
Does John Dalton, M.D. accept Medicare? ▼
John Dalton, M.D. appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Dalton, M.D.'s credentials? ▼
John Dalton, M.D.'s NPI is 1225013493 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.