Nathan S. Grigg, DO
Internal Medicine Physician · Pueblo, CO
Nathan S. Grigg, DO is an internal medicine physician with a practice address in Pueblo, Colorado, and NPI 1881214567, issued on Apr 22, 2020. Check the license (Colorado 0008359, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Nathan S. Grigg
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 0008359 CO
Self-reported in NPPES; status is on the state search - Practice location
- 400 W 16TH St, Pueblo, CO 81003
- Phone
- (719) 595-7585
- Enumerated
- Apr 22, 2020
- Record last updated
- Mar 22, 2023
- Medicare enrollment
- Enrolled (PECOS I20230705003515); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 400 W 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathan S. Grigg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 0008359Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average internal medicine physician in 2024
329 Medicare Part D claims for 170 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
Most prescribed
- Prednisone20 claims
- Clopidogrel17 claims
- Oxycodone Hcl16 claims
- Atorvastatin Calcium13 claims
- Cefpodoxime Proxetil12 claims
- Amoxicillin-Clavulanate Potass11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 97.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $34.86
1 payment: food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Parkview Ancillary Services CorporationPueblo, CO
- Poudre Valley Medical Group LLCPueblo, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan S. Grigg among 2,046 internal medicine physician records in Colorado
Nathan S. Grigg, DO is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 91% of them.
- NPI issued2020 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2006 among the 1,090 with a school on file
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
91 internal medicine physician records list a practice address in Pueblo
They are 91 of the 3,717 NPPES records with a practice address in Pueblo, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Pueblo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lev Asherov, MDPueblo, CO 810031164685228
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- Carl Bartecchi, M.D.Pueblo, CO 810031457335705
- Suneel Boyareddygari, MDPueblo, CO 810031730262478
- Douglas Duffee, M.D.Pueblo, CO 810031851372320
- Indira Kedlaya, MDPueblo, CO 810031891771382
- Janice Kulik, M.D.Pueblo, CO 810031487615928
- Robert Manguso, M.D.Pueblo, CO 810031568405892
Common questions
What is Nathan S. Grigg, DO's NPI number?
Nathan S. Grigg, DO's National Provider Identifier (NPI) is 1881214567, issued on Apr 22, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Nathan S. Grigg, DO located?
The NPPES record lists a practice address at 400 W 16TH St, Pueblo, CO, 81003. Phone: (719) 595-7585. Providers update this record themselves, so call before visiting.
How can I verify Nathan S. Grigg, DO's license?
NPPES lists Colorado license number 0008359, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan S. Grigg, DO prescribe under Medicare Part D?
In 2024, Nathan S. Grigg, DO had 329 Medicare Part D claims for 170 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nathan S. Grigg, DO's MIPS final score?
The 2023 MIPS final score is 97.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.