Dr. Nathan S. Grigg, DO
- Medicare services, 2024
- 664
- Medicare patients, 2024
- 255
- Part D claims, 2024
- 329
- Hospital affiliations
- 2
- Industry payments
- $259
- Practice address
- 400 W 16th St, Pueblo, CO 81003
- Practice phone
- Call (719) 584-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Nathan S. Grigg is an internist in Pueblo, Colorado
Dr. Grigg practices at UCHealth Parkview Medical Center in Pueblo, Colorado, part of UCHealth.
Dr. Grigg's NPI, 1881214567, was assigned on April 22, 2020. Dr. Grigg holds Colorado license 0008359.
- NPI
- 1881214567NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365853454
- NPI enumeration date
- April 22, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (719) 584-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nathan S. Grigg practices at UCHealth Parkview Medical Center in Pueblo, Colorado
Dr. Grigg's primary practice is UCHealth Parkview Medical Center, at 400 W 16th St, Pueblo, CO 81003 in Pueblo County. The practice phone is (719) 584-4000.
- UCHealth Parkview Medical Center400 W 16th St, Pueblo, CO 81003 · Pueblo CountyPhone(719) 584-4000
Source: Dmand AI Affiliation Data
Dr. Nathan S. Grigg is affiliated with 3 sites of care and 1 medical group
Dr. Grigg's primary practice is UCHealth Parkview Medical Center in Pueblo, Colorado, part of UCHealth. Dr. Grigg is also affiliated with Mount San Rafael Hospital. The medical group on file is UCHealth Medical Group. Dmand AI also links Dr. Grigg to 1 more breast imaging center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nathan S. Grigg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grigg practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCHealth Parkview Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nathan S. Grigg is one of 1,668 internists in Colorado
Internal medicine is Dr. Grigg's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Grigg is licensed in Colorado.
Specialties and state licenses
- Internal medicine, ColoradoPrimary
Internists near Dr. Grigg
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nathan S. Grigg billed Medicare for 664 services in 2024
CMS data shows 664 Medicare services from Dr. Grigg across 5 procedure codes in 2024, for 255 Medicare patients. Medicare paid $56,250 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Grigg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2412024: 664176%
Dr. Grigg compared with the Colorado median for internists, 2024
- Dr. Grigg
- Colorado median
- Medicare services
- 664vs 37776% above
- Medicare patients
- 255vs 18637% above
- Part D claims
- 89vs 31872% below
Medians across 1,630 internists in Colorado with Dmand AI profiles that report each measure.
Dr. Grigg's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nathan S. Grigg treated 255 Medicare patients in 2024, average age 74
CMS counts 255 Medicare patients who saw Dr. Grigg in 2024. The largest group is 75 to 84, with 84 patients. 75% of them have high blood pressure, and 74% have high cholesterol. 36% are also on Medicaid. Their average risk score is 2.26, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Grigg's median patient age at 75, with 54% women.
Dr. Grigg's Medicare patients by age, 2024
Dr. Grigg's Medicare patients by sex, 2024
- Women13352%
- Men12248%
Chronic conditions among Dr. Grigg's Medicare patients, 2024
- High blood pressure75%
- High cholesterol74%
- Arthritis53%
- Diabetes45%
- Chronic kidney disease41%
- Mood disorders41%
- COPD38%
- Heart failure38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grigg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nathan S. Grigg wrote 329 Medicare Part D claims in 2024
In 2024, Dr. Grigg wrote 329 Medicare Part D claims for 170 patients. 88% of them were for generic drugs. CMS names the drug for 89 of them, across 6 drugs with 11 or more claims each, at $894 in total drug cost. In 2023, CMS named 123 claims across 6 drugs.
Dr. Grigg's Part D claims by kind of drug, 2024
- Generic288 claims88%
- Brand-name and other41 claims12%
Dr. Grigg's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Grigg's Part D claims, 2024
- Opioids6%21 of 329 claims
- Antibiotics19%63 of 329 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1232024: 8928%
Drugs named by CMS: 6 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Nathan S. Grigg takes part in Medicare
Dr. Grigg accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Nathan S. Grigg received $259 in industry payments from 2022 to 2024
CMS Open Payments shows 3 general payments to Dr. Grigg from 2 drug and device companies from 2022 to 2024. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $224.
General payments to Dr. Grigg by program year, 2022 to 2024
Companies that paid Dr. Grigg the most, 2022 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nathan S. Grigg's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nathan S. Grigg
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nathan S. Grigg's NPI number?
Dr. Nathan S. Grigg's NPI number is 1881214567. It was assigned on April 22, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Nathan S. Grigg?
Dr. Nathan S. Grigg is an internist in Pueblo, Colorado. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Nathan S. Grigg practice?
Dr. Grigg practices at 400 W 16th St, Pueblo, CO 81003. Dr. Grigg's primary practice is UCHealth Parkview Medical Center in Pueblo, Colorado, part of UCHealth. Dmand AI also links Dr. Grigg to 1 breast imaging center.
What is Dr. Nathan S. Grigg's office phone number?
The practice phone on file for Dr. Grigg is (719) 584-4000.
What is Dr. Nathan S. Grigg's medical license number?
Dr. Grigg holds Colorado license 0008359.
Which hospitals is Dr. Nathan S. Grigg affiliated with?
Dr. Grigg practices at UCHealth Parkview Medical Center in Pueblo, Colorado. Dr. Grigg is also affiliated with Mount San Rafael Hospital.
What medical group is Dr. Nathan S. Grigg part of?
Dr. Grigg is linked to UCHealth Medical Group.
Does Dr. Nathan S. Grigg accept Medicare?
Yes. CMS data shows Dr. Grigg billed Medicare for 664 services in 2024, and Dr. Grigg accepts Medicare assignment.
How many Medicare patients does Dr. Nathan S. Grigg see?
CMS counts 255 Medicare patients who saw Dr. Grigg in 2024, with an average age of 74.
What services does Dr. Nathan S. Grigg bill to Medicare?
In 2024, Dr. Grigg's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
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What drugs does Dr. Nathan S. Grigg prescribe most?
In 2024 Medicare Part D data, Dr. Grigg's most prescribed drugs by claims were Prednisone, Clopidogrel and Oxycodone HCl.
Has Dr. Nathan S. Grigg received payments from drug or device companies?
CMS Open Payments shows $259 in general payments to Dr. Grigg from 2 companies from 2022 to 2024. The largest total came from Abbvie Inc.
How long has Dr. Nathan S. Grigg been practicing?
Dr. Grigg graduated from medical school in 2020, 6 years ago.
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