1. Home
  2. Directory
  3. South Carolina
  4. Charleston
  5. Internal Medicine
  6. NPI Profile

DR. JOHN MICHAEL GRAYSON MD
NPI 1902862253
Internal Medicine - Cardiovascular Disease in Charleston, SC

Active since April 25, 2006
316 CALHOUN ST, CHARLESTON, SC 29401(843) 789-1620(843) 724-2440 Get Directions Write a Review

NPPES record last updated: October 19, 2015. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. John Michael Grayson Md NPPES

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

DR. JOHN MICHAEL GRAYSON MD (NPI 1902862253) is an individual cardiovascular disease provider in Charleston, South Carolina, licensed in South Carolina (8736) and active in the NPI registry since April 2006.

NPPES Registry Identity

NPI1902862253
Entity TypeIndividualMale
Primary Taxonomy207RC0000X
Provider Legal NameDR. JOHN MICHAEL GRAYSONCredential: MD
Location Address316 CALHOUN STCharleston, SC 29401-1113
Mailing AddressPo Box 751649Charlotte, NC 28275-1649 · (843) 789-1620 · Fax (843) 724-2440
Phone(843) 789-1620
Fax(843) 724-2440
Sole ProprietorNo
Enumeration DateApril 25, 2006
Last NPPES UpdateOctober 19, 2015
✔ NPI 1902862253 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
License✔ Licensed in SC · 8736
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
316 CALHOUN ST, Charleston, SC 29401
Open in Google Maps ↗

Other Identifiers 4

OtherP00930478SC · Railroad Medicare Id-rsfpn
Medicaid087364SC
Medicare UPIND90679SC
Medicare PIND906799223SC

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.

CHRISTIAN ANTON SUNG PA-C
Physician Assistant
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 720-8490
AMY LYNN CANINO PA-C
Physician Assistant
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 402-1638
KAREN L SPODAREK D.O.
Radiology (Diagnostic Radiology)
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 724-2154
JOHNNY PHILLIPS CAMPBELL MD
Radiology (Diagnostic Radiology)
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 724-2988
RONA S CUSHMAN NNP
Nurse Practitioner (Neonatal, Critical Care)
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 402-1638
ROPER SAINT FRANCIS PHYSICIANS NETWORK
Internal Medicine
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 724-2450
MRS. ALISON MARIE BONDELL APRN
Nurse Practitioner (Acute Care)
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 724-2450
MRS. DEBORAH LYNN WALKER AGACNP-BC
Nurse Practitioner (Acute Care)
316 CALHOUN ST
CHARLESTON, SC 29401
Charleston County (843) 724-2450

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 Grayson's NPI number?

The NPI number for John Grayson is 1902862253. It was assigned to this individual provider in the NPPES registry on April 25, 2006.

Where is John Grayson located?

John Grayson practices at 316 Calhoun St, Charleston, SC 29401. The listed phone number is (843) 789-1620.

What is John Grayson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

When was this NPI record last updated?

The NPPES record for John Grayson was last updated on October 19, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years 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.