Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK A DENNIS M.D.
NPI 1649256561
Radiology - Diagnostic Radiology in Englewood, CO

Q: What is Mark Dennis's NPI number?

The NPI number for Mark Dennis is 1649256561. It was assigned to this individual provider in the NPPES registry on December 22, 2005.

Q: What is Mark Dennis's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Q: When was this NPI record last updated?

The NPPES record for Mark Dennis was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 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.

Active since December 22, 2005PECOS EnrolledAccepts Medicare Assignment

85.28/100

CMS Quality Rating

10800 E GEDDES AVE STE 300, ENGLEWOOD, CO 80112(303) 761-9190(720) 874-4462 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 29, 2026, Dec 14, 2022 (2 updates tracked since 2022).

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About Dr. Mark A Dennis M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK A DENNIS M.D. (NPI 1649256561) is an individual diagnostic radiology provider in Englewood, Colorado, licensed in Colorado (23198) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS and is a graduate of Other (1979).

NPPES Registry Identity

NPI1649256561

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameDR. MARK A DENNISCredential: M.D.

Location Address10800 E GEDDES AVE STE 300Englewood, CO 80112-3895

Mailing Address10800 E Geddes Ave Ste 300Englewood, CO 80112-3895 · (303) 761-9190 · Fax (720) 874-4462

Phone(303) 761-9190

Fax(720) 874-4462

Sole ProprietorNo

Medical School CMSOtherGraduated 1979

Enumeration DateDecember 22, 2005

Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration

NPPES CertifiedDecember 14, 2022

✔ NPI 1649256561 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

Licenses✔ Licensed in CO · 23198✔ Licensed in NE · 25104✔ Licensed in KS · 04-36688✔ Licensed in HI · MD17507

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

10800 E GEDDES AVE STE 300, Englewood, CO 80112

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Other Identifiers 19

Medicaid1649256561IA

Medicaid1649256561MO

Medicaid1649256561MT

Medicaid1649256561WY

Medicaid200364600IN

Medicaid200638130AOK

Medicaid42866602AZ

Medicaid84-059792913NE

Medicaid104699390MI

Medicaid208221601TX

Medicaid1649256561CA

Medicaid200425880AKS

Medicaid0224905WA

Medicaid200067205MO

Medicaid2301381LA

Medicaid01231984CO

Medicaid10025709000NE

Medicaid64048556KY

Medicaid23727055NM

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health, Oscar Insurance Company, Select Health.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

Dr. Mark A Dennis M.d. 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.

PECOS PAC ID8325947724

PECOS Enrollment IDI20091002000065

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Mark Dennis reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Medical Imaging Of Colorado Radiology Imaging Assc PC Etal Pt

Same address

Diagnostic Radiology

10800 E GEDDES AVE STE 300
Englewood, CO 80112

Reassigned Medicare billing, Colorado enrollment
160 clinicians in this Medicare group

NPI 1336188234 (303) 761-9190

Radiology Imaging Associates, PC

Same address

Diagnostic Radiology

10800 E GEDDES AVE STE 300
Englewood, CO 80112

Reassigned Medicare billing, Colorado enrollment
162 clinicians in this Medicare group

NPI 1679513196 (303) 761-9190

Radiology Imaging Of Nebraska, LLC

174 mi

Diagnostic Radiology

4021 AVENUE B
Scottsbluff, NE 69361

Reassigned Medicare billing, Colorado enrollment
131 clinicians in this Medicare group

NPI 1184869901 (308) 635-3711

Hawaii Radiologic Associates, Ltd.

3,267 mi

Diagnostic Radiology

670 PONAHAWAI ST., SUITE 110
Hilo, HI 96720

Reassigned Medicare billing, Colorado enrollment
127 clinicians in this Medicare group

NPI 1174679443 (808) 933-2540

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 7

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.

Screening mammography 77067

Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.

1,188 services1,188 patients

Screening 3d breast mammography 77063

Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.

1,187 services1,187 patients

Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) G0279

Diagnostic digital breast tomosynthesis is a 3D imaging test that allows doctors to examine your breast tissue layer by layer. It's performed on one or both sides. It helps in detecting abnormalities more accurately. It's often done in addition to other tests.

194 services193 patients

Limited ultrasound scan of 1 breast 76642

A limited ultrasound scan of one breast is a non-invasive imaging test. It uses sound waves to create pictures of the inside of your breast. It helps identify any unusual growths or changes. It's safe, quick, and typically painless.

142 services142 patients

Diagnostic mammography of 1 breast 77065

Diagnostic mammography of 1 breast is a detailed imaging test that allows doctors to closely examine a specific area in the breast. It's often used when a routine screening reveals an abnormality. This test can help identify any unusual changes or issues.

104 services104 patients

Diagnostic mammography of both breasts 77066

Diagnostic mammography involves using special imaging technology to capture detailed images of both breasts. This procedure helps in identifying any unusual changes or abnormalities. It's a crucial step in ensuring breast health and early detection of potential issues.

93 services93 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80112 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$89.43 typical visit price

range $58.06 – $174.82

Typical copayment $22.35 (range $14.51 – $43.70)

Most-billed visit code 99203

Established Patient

$72.20 typical visit price

range $18.88 – $142.79

Typical copayment $18.05 (range $4.72 – $35.69)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

85.28/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

98.13

Improvement Activities

Cost

54.36

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.

ADAM DANIEL WILLIAMS MD

Radiology (Diagnostic Radiology)