GARY S. ALLEN M.D.
NPI 1154327872
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Littleton, CO

Q: What is Gary Allen's NPI number?

The NPI number for Gary Allen is 1154327872. It was assigned to this individual provider in the NPPES registry on June 27, 2005.

Q: What is Gary Allen's specialty?

The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.

Q: When was this NPI record last updated?

The NPPES record for Gary Allen was last updated on December 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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 June 27, 2005PECOS EnrolledAccepts Medicare Assignment

7780 S BROADWAY STE 170, LITTLETON, CO 80122(303) 269-2920(303) 269-2921 Get Directions Write a Review

NPPES record last updated: December 10, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 10, 2025, Apr 19, 2024, Mar 30, 2023 (3 updates tracked since 2023).

On this page

About Gary S. Allen M.d. NPPES

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

GARY S. ALLEN M.D. (NPI 1154327872) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Littleton, Colorado, licensed in Florida (ME80476) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Adventhealth Waterman, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1154327872

Entity TypeIndividualMale

Primary Taxonomy208G00000X

Provider Legal NameGARY S. ALLENCredential: M.D.

Location Address7780 S BROADWAY STE 170Littleton, CO 80122-2633

Mailing Address7780 S Broadway Ste 170Littleton, CO 80122-2633

Phone(303) 269-2920

Fax(303) 269-2921

Sole ProprietorNo

Medical School CMSAlbany Medical College Of Union UniversityGraduated 1991

Enumeration DateJune 27, 2005

Last NPPES UpdateDecember 10, 20253 updates tracked since enumeration

NPPES CertifiedDecember 10, 2025

✔ NPI 1154327872 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyThoracic Surgery (Cardiothoracic Vascular Surgery)Allopathic & Osteopathic Physicians

Taxonomy Code208G00000X

Licenses✔ Licensed in FL · ME80476✔ Licensed in CO · DR.0073193

Definition

A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.

7780 S BROADWAY STE 170, Littleton, CO 80122

Open in Google Maps ↗

Secondary Practice Locations 2

Location 11222 S Orange Ave Fl 3Orlando, FL 32806-1215 · Phone (321) 841-3356 · Fax (321) 841-7799

Location 23310 Waterman WayTavares, FL 32778-5250 · Phone (352) 343-1216 · Fax (352) 343-1582

Other Identifiers 1

Medicaid258936200FL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter of Alabama, Florida Blue (BlueCross BlueShield FL) and more.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

Gary S. Allen 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 ID3274508908

PECOS Enrollment IDI20040826001439, I20251222003462

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 Gary Allen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Portercare Adventist Health System

Same address

Vascular Surgery

7780 S BROADWAY STE 260
Littleton, CO 80122

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

NPI 1407690266 (720) 330-1300

Florida Hospital Healthcare Partners, Inc

1,532 mi

Internal Medicine

301 MEMORIAL MEDICAL PKWY
Daytona Beach, FL 32117

Reassigned Medicare billing, Florida enrollment
733 clinicians in this Medicare group

NPI 1780100529 (386) 231-6000

Florida Hospital Medical Group Inc

1,547 mi

Family Medicine

1115 E RIDGEWOOD ST
Orlando, FL 32803

Reassigned Medicare billing, Florida enrollment
3,005 clinicians in this Medicare group

NPI 1225034234 (407) 841-1100

Orlando Health Medical Group Inc

1,547 mi

Internal Medicine

52 W UNDERWOOD ST
Orlando, FL 32806

Reassigned Medicare billing, Florida enrollment
3,290 clinicians in this Medicare group

NPI 1669429577 (321) 841-2452

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 2

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.

Coronary artery bypass using artery graft, 1 graft 33533

A coronary artery bypass with one artery graft is a surgical procedure to improve blood flow to your heart. An artery from another part of your body is used to bypass a blocked or narrowed coronary artery. This can help reduce chest pain and risk of heart attack.

17 services17 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.

11 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Adventhealth Waterman

Acute Care Hospitals · Tavares, FL

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number100057

Location1000 Waterman WayTavares, FL 32778 · Lake County

Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80122 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

$174.82 typical visit price

range $58.06 – $174.82

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

Most-billed visit code 99205

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.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JEFFREY MILLIKEN MD

Thoracic Surgery (Cardiothoracic Vascular Surgery)