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MARK THOMAS HOLLEY M.D.
NPI 1588673107
Emergency Medicine - Emergency Medical Services in Denver, CO

Active since August 05, 2006PECOS EnrolledAccepts Medicare Assignment
2227 WEST 35TH AVE., DENVER, CO 80211(303) 455-0815 Get Directions Write a Review

NPPES record last updated: April 30, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mark Thomas Holley M.d. NPPES

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

MARK THOMAS HOLLEY M.D. (NPI 1588673107) is an individual emergency medical services provider in Denver, Colorado, licensed in Colorado (36330) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Denver, and is a graduate of Other (1994).

NPPES Registry Identity

NPI1588673107
Entity TypeIndividualMale
Primary Taxonomy207PE0004X
Provider Legal NameMARK THOMAS HOLLEYCredential: M.D.
Location Address2227 WEST 35TH AVE.Denver, CO 80211
Mailing Address2227 West 35th Ave.Denver, CO 80211 · (303) 455-0815
Phone(303) 455-0815
Sole ProprietorNo
Medical School CMSOtherGraduated 1994
Enumeration DateAugust 5, 2006
Last NPPES UpdateApril 30, 2021
NPPES CertifiedApril 30, 2021
✔ NPI 1588673107 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency Medicine · Emergency Medical ServicesAllopathic & Osteopathic Physicians
Taxonomy Code207PE0004X
License✔ Licensed in CO · 36330
Definition
An emergency medicine physician who specializes in non-hospital based emergency medical services (e.g., disaster site, accident scene, transport vehicle, etc.) to provide pre-hospital assessment, treatment, and transport patients.
2227 WEST 35TH AVE., Denver, CO 80211
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Secondary Practice Location 1

Location 11400 Jackson StDenver, CO 80206 · Phone (303) 388-4461 · Fax (303) 398-1211

Other Identifiers 1

Medicaid01363308CO

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

Mark Thomas Holley 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 ID9830105782
PECOS Enrollment IDI20060301000547
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

4

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

Emergency Service Physicians, Inc.
4.1 mi
Emergency Medicine
8300 EAST 38TH AVE
Wheat Ridge, CO 80033
  • Reassigned Medicare billing, Colorado enrollment
  • 91 clinicians in this Medicare group
NPI 1326097668 (330) 493-4443
National Jewish Health
4.2 mi
General Acute Care Hospital
1400 JACKSON ST
Denver, CO 80206
  • Reassigned Medicare billing, Colorado enrollment
  • 281 clinicians in this Medicare group
NPI 1326015777 (303) 388-4461
Usacs Of Colorado Inc
6.9 mi
Emergency Medicine
2525 S DOWNING ST
Denver, CO 80210
  • Reassigned Medicare billing, Colorado enrollment
  • 468 clinicians in this Medicare group
NPI 1104452952 (330) 493-4443
Usacs Community Emergency Services Of Colorado, Inc.
8.4 mi
Emergency Medicine
3280 S WADSWORTH BLVD
Lakewood, CO 80227
  • Reassigned Medicare billing, Colorado enrollment
  • 352 clinicians in this Medicare group
NPI 1992330484 (330) 493-4443

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 8

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
37 services36 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
32 services30 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
25 services24 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
23 services23 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
15 services15 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80211 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
$102.03 typical visit price
range $18.88 – $142.79
Typical copayment $25.50 (range $4.72 – $35.69)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Mark Holley's NPI number?

The NPI number for Mark Holley is 1588673107. It was assigned to this individual provider in the NPPES registry on August 5, 2006.

Where is Mark Holley located?

Mark Holley practices at 2227 West 35th Ave., Denver, CO 80211. The listed phone number is (303) 455-0815.

What is Mark Holley's specialty?

The primary specialty registered for this NPI is Emergency Medicine, specializing in Emergency Medical Services, with taxonomy code 207PE0004X.

Is Mark Holley enrolled in Medicare?

Yes. Mark Holley 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 organizations bill Medicare for Mark Holley's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Holley reassigns Medicare benefits to 4 organizations: Emergency Service Physicians, Inc. (Wheat Ridge, CO), National Jewish Health (Denver, CO), Usacs Of Colorado Inc (Denver, CO) and Usacs Community Emergency Services Of Colorado, Inc. (Lakewood, CO). Each 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 Mark Holley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Holley was last updated on April 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.