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MARK GREENWALD
NPI 1720144975
Ophthalmology in Denver, CO

Active since December 29, 2006PECOS Enrolled
777 BANNOCK ST, DENVER, CO 80204(303) 436-4949(303) 602-4560 Get Directions Write a Review

NPPES record last updated: February 11, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 11, 2025, Oct 24, 2022, May 19, 2022 and 2 more (5 updates tracked since 2022).

About Mark Greenwald NPPES

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

MARK GREENWALD (NPI 1720144975) is an individual ophthalmology provider in Denver, Colorado, licensed in Colorado (DR.0070955) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1720144975
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameMARK GREENWALD
Location Address777 BANNOCK STDenver, CO 80204-4597
Mailing Address777 Bannock StDenver, CO 80204-4597 · (303) 436-4949 · Fax (303) 602-4560
Phone(303) 436-4949
Fax(303) 602-4560
Sole ProprietorNo
Enumeration DateDecember 29, 2006
Last NPPES UpdateFebruary 11, 20255 updates tracked since enumeration
NPPES CertifiedFebruary 11, 2025
✔ NPI 1720144975 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
Licenses✔ Licensed in CO · DR.0070955✔ Licensed in IL · 036055837
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
777 BANNOCK ST, Denver, CO 80204
Open in Google Maps ↗

Secondary Practice Location 1

Location 15841 S Maryland AveChicago, IL 60637-1443 · Phone (888) 824-0200

Accepted Insurance

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

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark Greenwald is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

3

Medicare enrollment records show Mark Greenwald reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Denver Health And Hospital Authority
Same address
General Practice
777 BANNOCK ST
Denver, CO 80204
  • Reassigned Medicare billing, Colorado enrollment
  • 2,259 clinicians in this Medicare group
NPI 1477569838 (303) 436-6000
Illinois College Of Optometry
921 mi
Optometrist
3241 S MICHIGAN AVENUE
Chicago, IL 60616
  • Reassigned Medicare billing, Illinois enrollment
  • 143 clinicians in this Medicare group
NPI 1285612390 (312) 225-6200
University Of Chicago
922 mi
Multi-Specialty
5841 S MARYLAND AVE, UCPG/MC 1099
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 2,237 clinicians in this Medicare group
NPI 1821048786 (773) 702-9200

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80204 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
$132.55 typical visit price
range $58.06 – $174.82
Typical copayment $33.13 (range $14.51 – $43.70)
Most-billed visit code 99204
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 20

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

MS. KATHERINE JEANNE CARLEY RN, MSN, CS
Clinical Nurse Specialist (Psychiatric/Mental Health)
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-6630
RYAN DEAN LATERZA M.D.
Anesthesiology
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-6000
BARBARA E ANDERSON NP
Nurse Practitioner
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 602-0340
PHILIP ANDREOLI D.O.
Hospitalist
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-4949
JESSICA RENEE KUDLOCK LCSW
Social Worker (Clinical)
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 602-7220
ELIZABETH PERKINS-PRIDE
Nurse Practitioner
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-6000
KIRSTEN ERIKSEN PA-C
Physician Assistant
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-6000
KATHRYN IRENE GARNER MD, MPH
Family Medicine
777 BANNOCK ST
DENVER, CO 80204
Denver County (303) 436-6000

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 Greenwald's NPI number?

The NPI number for Mark Greenwald is 1720144975. It was assigned to this individual provider in the NPPES registry on December 29, 2006.

Where is Mark Greenwald located?

Mark Greenwald practices at 777 Bannock St, Denver, CO 80204. The listed phone number is (303) 436-4949.

What is Mark Greenwald's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Mark Greenwald enrolled in Medicare?

Yes. Mark Greenwald is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mark Greenwald's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Greenwald reassigns Medicare benefits to 3 organizations: Denver Health And Hospital Authority (Denver, CO), Illinois College Of Optometry (Chicago, IL) and University Of Chicago (Chicago, IL). 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 Greenwald's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Greenwald accept?

Health plans from Oscar Health list Mark Greenwald 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.

When was this NPI record last updated?

The NPPES record for Mark Greenwald was last updated on February 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.