NATHAN S GRIGG DO
NPI 1881214567
Internal Medicine in Pueblo, CO
About Nathan S Grigg Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NATHAN S GRIGG DO (NPI 1881214567) is an individual internal medicine provider in Pueblo, Colorado, licensed in North Carolina (2026-04237) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Greenville, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Nathan S Grigg Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Nathan Grigg reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Loveland, CO 80538
- Reassigned Medicare billing, Colorado enrollment
- 2,596 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 81003 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
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 Nathan Grigg's NPI number?
The NPI number for Nathan Grigg is 1881214567. It was assigned to this individual provider in the NPPES registry on April 22, 2020.
Where is Nathan Grigg located?
Nathan Grigg practices at 400 W 16th St, Pueblo, CO 81003. The listed phone number is (719) 595-7585.
What is Nathan Grigg's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nathan Grigg enrolled in Medicare?
Yes. Nathan Grigg is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Nathan Grigg's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathan Grigg reassigns Medicare benefits to Poudre Valley Medical Group, LLC (Loveland, CO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nathan Grigg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathan Grigg accept?
Health plans from Select Health list Nathan Grigg as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Nathan Grigg was last updated on October 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 days 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.
# Nathan S Grigg, DO · NPI 1881214567
Internal Medicine physician in Pueblo, Colorado. Individual provider, active in the CMS NPPES registry since April 22, 2020.
## Identity
- **NPI:** 1881214567 (Entity type: Individual)
- **Enumerated:** April 22, 2020
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2026-04237 (North Carolina)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 400 W 16TH ST, Pueblo, CO 81003-2745
- **Phone:** (719) 595-7585
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** Poudre Valley Medical Group, LLC (NPI 1366763260, Loveland, CO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** October 19, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1881214567) · Data from the CMS NPPES public registry.