NPI registry status
Active
2026 NPPES data Surgery Physician NPI 1871122135 MD
Verify on CMS → Charles Marriott, MD
Surgery Physician in Greeley, Colorado.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 36,199 in Surgery Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
What the federal data shows
Charles Marriott, MD is a Surgery Physician in Greeley, Colorado, listed in the federal CMS National Provider Identifier registry.
- Likely
- board-certified (heuristic)
- #46
- Surgery Physician rank among Colorado specialties
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1871122135 · Surgery Physician
NPI-10 · ENUM-RECENT · TAX-MID · RX-NONE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1871122135
- ENUM-RECENT 2020
- TAX-MID 36K Surgery Physician
- RX-NONE No Part D
- BOOK-LIGHT 634 in Colorado
- PHOTO-ENUM Ryan Phillip Alonzo · 2020
✓
Board certification likely (heuristic, not verified)
Charles Marriott, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Charles Marriott, MD?
Quality data not reportedPrimary specialty
Surgery Physician
Specialty distribution in Colorado
How Surgery Physician compares to other specialties among Colorado providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Surgery Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1871122135 |
|---|---|
| Specialty | Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/07/2020 |
Hospital and facility affiliations
Facilities where Charles Marriott, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Banner Health Physicians Colorado LLC
Greeley, CO
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Surgery Physician Overview
How Charles Marriott, MD fits within the Surgery Physician landscape nationally.
36,199
Surgery Physician Providers in US
56
States with Surgery Physician
169
Avg Claims per Provider
Nationwide Surgery Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Marriott, both outside Colorado so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2020)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Surgery Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Marriott.
One of 634 Surgery Physician providers enrolled in Colorado, 5 are shown here.
Dr. David Abts
M.D.
Aurora, CO
Dr. Stuart Ackley
MD
Grand Junction, CO
Dr. Muhammad Aftab
M.B.,B,S, MD
Aurora, CO
Dr. Rizwan Ahmed
M.D.
Durango, CO
Dr. Eric Ahnfeldt
D.O.
Fort Carson, CO
Compare Surgery Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Charles Marriott, MD's specialty? ▼
Charles Marriott, MD specializes in Surgery Physician and practices in Greeley, Colorado. Credentials: MD.
Where is Charles Marriott, MD located? ▼
Charles Marriott, MD is located at 1800 15TH ST STE 200, Greeley, CO, 80631. Phone: (970) 810-8216.
What is Charles Marriott, MD's NPI number? ▼
Charles Marriott, MD's National Provider Identifier (NPI) is 1871122135, issued on 04/07/2020.
How many Surgery Physician providers are there in the US? ▼
There are 36,199 Surgery Physician providers across 56 states in the US. The average Surgery Physician provider writes 169 Medicare Part D claims per year.
Does Charles Marriott, MD accept Medicare? ▼
Charles Marriott, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Marriott, MD's credentials? ▼
Charles Marriott, MD's NPI is 1871122135 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.