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MICHAEL S FIRSTENBERG MD
NPI 1912961749
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Aurora, CO

Active since April 17, 2006PECOS EnrolledAccepts Medicare Assignment
1444 S POTOMAC ST STE 200, AURORA, CO 80012(303) 226-4650(303) 751-6069 Get Directions Write a Review

NPPES record last updated: July 8, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 8, 2025, Aug 1, 2022, Feb 5, 2021 and 1 more (4 updates tracked since 2019).

About Michael S Firstenberg Md NPPES

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

MICHAEL S FIRSTENBERG MD (NPI 1912961749) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Aurora, Colorado, licensed in Colorado (0059627) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Maui Memorial Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1912961749
Entity TypeIndividualMale
Primary Taxonomy208G00000X
Provider Legal NameMICHAEL S FIRSTENBERGCredential: MD
Location Address1444 S POTOMAC ST STE 200Aurora, CO 80012-4509
Mailing Address525 E Market St, Po Box 2090Akron, OH 44304-1619 · (330) 996-8603
Phone(303) 226-4650
Fax(303) 751-6069
Sole ProprietorNo
Medical School CMSOtherGraduated 1996
Enumeration DateApril 17, 2006
Last NPPES UpdateJuly 8, 20254 updates tracked since enumeration
NPPES CertifiedJuly 8, 2025
✔ NPI 1912961749 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 CO · 0059627✔ Licensed in OH · 35074025✔ Licensed in NV · 22431✔ Licensed in ID · 5371563
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.
1444 S POTOMAC ST STE 200, Aurora, CO 80012
Open in Google Maps ↗

Secondary Practice Locations 2

Location 17190 S Cimarron RdLas Vegas, NV 89113-2171 · Phone (702) 675-3240 · Fax (702) 982-6347
Location 21055 N Curtis RdBoise, ID 83706-1309 · Phone (208) 302-0130 · Fax (208) 302-0135

Other Identifiers 1

Medicaid2626411OH

Accepted Insurance

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

Michael S Firstenberg Md 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 ID3870517733
PECOS Enrollment IDI20220629002235, I20220913001565, I20250722001381
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

7

Medicare enrollment records show Michael Firstenberg reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Monument Health Rapid City Hospital, Inc
310 mi
Occupational Medicine
6015 MOUNT RUSHMORE RD STE 2
Rapid City, SD 57701
  • Reassigned Medicare billing, South Dakota enrollment
  • 831 clinicians in this Medicare group
NPI 1376370288 (605) 755-2273
Saint Alphonsus Regional Medical Center Inc
650 mi
Psychologist
1055 N CURTIS RD
Boise, ID 83706
  • Reassigned Medicare billing, Idaho enrollment
  • 781 clinicians in this Medicare group
NPI 1649357716 (208) 367-4148
Ascension NE Wisconsin, Inc
887 mi
General Acute Care Hospital
500 S OAKWOOD RD
Oshkosh, WI 54904
  • Reassigned Medicare billing, Wisconsin enrollment
  • 194 clinicians in this Medicare group
NPI 1912527193 (920) 223-2000
Lafayette Health Ventures Inc
948 mi
Anesthesiology
1634 ELTON RD
Jennings, LA 70546
  • Reassigned Medicare billing, Louisiana enrollment
  • 428 clinicians in this Medicare group
NPI 1063124568 (337) 289-8944
Phoebe Gastroenterology Associates
1,282 mi
Clinic/Center
2740 RAY KNIGHT WAY, STE 100
Albany, GA 31707
  • Reassigned Medicare billing, Georgia enrollment
  • Medicare enrollment name: Phoebe Physician Group Inc
  • 1,118 clinicians in this Medicare group
NPI 1659627131 (229) 312-0669
Maui Health System A Kaiser Foundation Hospitals LLC
3,296 mi
General Acute Care Hospital
221 MAHALANI ST
Wailuku, HI 96793
  • Reassigned Medicare billing, Hawaii enrollment
  • 138 clinicians in this Medicare group
NPI 1013379460 (808) 244-9056
Ryan M Smith, Do Inc
3,345 mi
Cardiovascular Disease
46-001 KAMEHAMEHA HWY STE 212
Kaneohe, HI 96744
  • Reassigned Medicare billing, Hawaii enrollment
  • 10 clinicians in this Medicare group
NPI 1750901195 (808) 636-6393

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare 2

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

Maui Memorial Medical Center

Acute Care Hospitals · Wailuku, HI
3/5 CMS rating
OwnershipGovernment - State
CMS Certification Number120002
Location221 Mahalani StreetWailuku, HI 96793 · Maui County
Birthing friendly

Saint Alphonsus Regional Medical Center

Acute Care Hospitals · Boise, ID
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number130007
Location1055 North Curtis RoadBoise, ID 83706 · Ada County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80012 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.

GEOFFREY T SMITH PAC
Physician Assistant
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (303) 226-4650
ALISON HART PA-C
Physician Assistant (Surgical)
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (303) 226-4650
HEALTHONE CLINIC SERVICES - CARDIOVASCULAR LLC
Internal Medicine (Cardiovascular Disease)
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (303) 226-4650
JODY LONG NP
Nurse Practitioner (Family)
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (303) 226-4650
DOLLAYA TRESNER PA
Physician Assistant (Surgical)
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (270) 618-5932
HEALTHONE HEART CARE LLC
Internal Medicine (Cardiovascular Disease)
1444 S POTOMAC ST STE 200
AURORA, CO 80012
Arapahoe County (303) 226-4650

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 Michael Firstenberg's NPI number?

The NPI number for Michael Firstenberg is 1912961749. It was assigned to this individual provider in the NPPES registry on April 17, 2006.

Where is Michael Firstenberg located?

Michael Firstenberg practices at 1444 S Potomac St Ste 200, Aurora, CO 80012. The listed phone number is (303) 226-4650.

What is Michael Firstenberg's specialty?

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

Is Michael Firstenberg enrolled in Medicare?

Yes. Michael Firstenberg 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 Michael Firstenberg's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Firstenberg reassigns Medicare benefits to 7 organizations: Monument Health Rapid City Hospital, Inc (Rapid City, SD), Saint Alphonsus Regional Medical Center Inc (Boise, ID), Ascension NE Wisconsin, Inc (Oshkosh, WI), Lafayette Health Ventures Inc (Jennings, LA), Phoebe Gastroenterology Associates (Albany, GA) and 2 more organizations, listed in the Medicare section above. 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 Michael Firstenberg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michael Firstenberg accept?

Health plans from Avera Health Plans, HMSA, Oscar Insurance Company, Sanford Health Plan and Wellmark of South Dakota, Inc. list Michael Firstenberg as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Michael Firstenberg affiliated with any hospitals?

According to CMS data, Michael Firstenberg is affiliated with Maui Memorial Medical Center and Saint Alphonsus Regional Medical Center.

When was this NPI record last updated?

The NPPES record for Michael Firstenberg was last updated on July 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.