National Provider Identifier
William Spencer Grigg, D.O.
William Spencer Grigg, D.O. is listed in the NPPES registry with a primary specialty of Clinical Cardiac Electrophysiology Physician in Mountain Home, AR and a listed phone number of (870) 425-8288.
Source: public NPPES record, last updated August 13, 2026. This profile is informational and is not medical advice, a quality rating, or a provider recommendation.
Profile Overview
- NPI
- 1578050266
- Provider Type
- Individual
- Primary Specialty
- Clinical Cardiac Electrophysiology Physician
- Enumeration Date
- April 18, 2018
- Last Updated
- August 13, 2026
Practice Location
- 555 W 6Th St
- Mountain Home, AR 72653-3409
Phone: (870) 425-8288
Mailing Address
- PO Box 707
- Mountain Home, AR 72654-0707
Specialties
- Clinical Cardiac Electrophysiology Physician (207RC0001X)
- Hospitalist Physician (208M00000X)
- Internal Medicine Physician (207R00000X)
- Student in an Organized Health Care Education/Training Program (390200000X)
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Medicare Part B Activity
Reported 66 Medicare fee-for-service service lines in 2024.
Peer comparison
Compared to Internal Medicine providers in the Rochester, NY metro area.
This provider is in the 8th percentile for Medicare service volume.
Lower volume than many peers.
Performs 76% fewer Medicare services than the peer median.
Higher than 70 of 858 peers.
- Activity Percentile
- 8.2%
- Rank by Services
- 785 of 858
- Total Services
- 66
- Est. Allowed Value
- $10,467.84
- Dataset Year
- 2024
- Drug Code Share
- 0.0%
Estimated allowed value reflects Medicare fee-for-service allowed amounts only. It does not include Medicare Advantage, commercial insurance, cash-pay services, or employment compensation.
Peers are grouped by the broader Internal Medicine classification rather than the exact subspecialty label shown elsewhere on the page.
Percentile distribution
Each bar represents a 10-point percentile band of peers by total Medicare services for Internal Medicine across the Rochester, NY metro area. Taller bars indicate higher service-volume bands. Highlighted bar marks this provider's percentile band.
Observed service range: 11 to 6,379 total Medicare services.
Top Clinical Services
- 99223: Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
48 services | $8,164.43
- 99214: Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
18 services | $2,303.41
Full Record
- NPI
- 1578050266
- Entity Type
- Individual
- Last Name
- Grigg
- First Name
- William
- Middle Name
- Spencer
- Name Prefix
- Dr.
- Credential
- D.O.
- Mailing Street Address
- PO Box 707
- Mailing City
- Mountain Home
- Mailing State
- AR
- Mailing ZIP Code
- 72654-0707
- Mailing Country
- US
- Mailing Phone
- (870) 424-7070
- Mailing Fax
- (870) 424-6616
- Practice Street Address
- 555 W 6Th St
- Practice City
- Mountain Home
- Practice State
- AR
- Practice ZIP Code
- 72653-3409
- Practice Country
- US
- Practice Phone
- (870) 425-8288
- Practice Fax
- (870) 425-8299
- Enumeration Date
- April 18, 2018
- Last Updated
- August 13, 2026
- Sex
- Male
- Sole Proprietor
- No
- Certification Date
- August 13, 2026
- Taxonomies
- Clinical Cardiac Electrophysiology Physician (207RC0001X), Hospitalist Physician (208M00000X), Internal Medicine Physician (207R00000X), Student in an Organized Health Care Education/Training Program (390200000X)