Dr William Spencer Grigg, DO - Medicare Hospitalist in Pueblo, CO

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Dr William Spencer Grigg, DO is a medicare enrolled "Internal Medicine" physician in Pueblo, Colorado. He went to Philadelphia Col Of Osteo Med, Sewanee and graduated in 2018 and has 6 years of diverse experience with area of expertise as Hospitalist. He is a member of the group practice Parkview Ancillary Services Corporation, Catholic Health Initiatives Colorado, Poudre Valley Medical Group Llc and his current practice location is 311 W 14th St, Pueblo, Colorado. You can reach out to his office (for appointments etc.) via phone at (719) 595-7585.

Dr William Spencer Grigg is licensed to practice in Colorado (license number DR.0062850) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1578050266.

Contact Information

Dr William Spencer Grigg, DO
311 W 14th St,
Pueblo, CO 81003-2705
(719) 595-7585
(719) 595-7589

Map and Direction




Physician's Profile

Full NameDr William Spencer Grigg
GenderMale
SpecialityHospitalist
Experience6 Years
Location311 W 14th St, Pueblo, Colorado
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr William Spencer Grigg attended and graduated from Philadelphia Col Of Osteo Med, Sewanee in 2018
  NPI Data:
  • NPI Number: 1578050266
  • Provider Enumeration Date: 04/18/2018
  • Last Update Date: 01/26/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 9234476300
  • Enrollment ID: I20220204000744

Medical Identifiers

Medical identifiers for Dr William Spencer Grigg such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1578050266NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine TL.0007279 (Colorado)Secondary
208M00000XHospitalist DR.0062850 (Colorado)Secondary
390200000XStudent In An Organized Health Care Education/training Program TL.0007279 (Colorado)Secondary
207R00000XInternal Medicine DR.0062850 (Colorado)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Parkview Medical Center, IncPueblo, COHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Parkview Ancillary Services Corporation4385722511267
Catholic Health Initiatives Colorado8022927342998
Poudre Valley Medical Group Llc96382085491605

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr William Spencer Grigg allows following entities to bill medicare on his behalf.
Entity NameInpatient Services, Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1710999768
PECOS PAC ID: 5496651267
Enrollment ID: O20031211000419
Entity NameCatholic Health Initiatives Colorado
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1356783351
PECOS PAC ID: 8022927342
Enrollment ID: O20031215000462
Entity NameParkview Ancillary Services Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1982878765
PECOS PAC ID: 4385722511
Enrollment ID: O20080429000248
Entity NamePortercare Adventist Health System
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760761928
PECOS PAC ID: 0941110886
Enrollment ID: O20090115000327
Entity NamePoudre Valley Medical Group Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1366763260
PECOS PAC ID: 9638208549
Enrollment ID: O20100602000122
Entity NameBanner Hospital Based Physicians Colorado Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1821336769
PECOS PAC ID: 6800031386
Enrollment ID: O20130404000393
Entity NameColorado Hospitalist Services, Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1265806178
PECOS PAC ID: 4486957578
Enrollment ID: O20160123000040
Entity NameHospitalist Medicine Physicians Of Colorado-tcg
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1053890533
PECOS PAC ID: 3072981125
Enrollment ID: O20221121001014

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr William Spencer Grigg is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr William Spencer Grigg, DO
400 W. 16th Street, Graduate Medical Education Department,
Pueblo, CO 81003

Ph: (719) 584-4000		Dr William Spencer Grigg, DO
311 W 14th St,
Pueblo, CO 81003-2705

Ph: (719) 595-7585

Reviews and Comments


Internal Medicine Doctors in Pueblo, CO

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Greg Alan Bowman, MD
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Lauren E. Sullenberger, DO
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Peter Lochow, M.D.
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Dr. Raj Vashistha, MD
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Dr. Rebecca Elizabeth Holder, D.O.
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Phone: 719-542-0032    Fax: 719-553-1904

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.