DR. KASSANDRA KAY MCMILLEN M.D,
NPI 1659746477
Obstetrics & Gynecology in Castle Rock, CO

Q: What is Kassandra Mcmillen's NPI number?

The NPI number for Kassandra Mcmillen is 1659746477. It was assigned to this individual provider in the NPPES registry on December 4, 2015. The provider is also known as Kassandra Thomas.

Q: What is Kassandra Mcmillen's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Active since December 04, 2015PECOS EnrolledAccepts Medicare Assignment

2350 MEADOWS BLVD, CASTLE ROCK, CO 80109(720) 455-0350(720) 455-0351 Get Directions Write a Review

NPPES record last updated: February 26, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 26, 2025, Apr 21, 2022, Nov 23, 2020 and 2 more (5 updates tracked since 2015).

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About Dr. Kassandra Kay Mcmillen M.d, NPPES

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

DR. KASSANDRA KAY MCMILLEN M.D, (NPI 1659746477) is an individual obstetrics & gynecology provider in Castle Rock, Colorado, licensed in Colorado (DR0060302) and active in the NPI registry since December 2015. She is enrolled in Medicare PECOS, maintains a secondary practice location in Denver, and is a graduate of University Of Arkansas College Of Medicine (2014).

NPPES Registry Identity

NPI1659746477

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameDR. KASSANDRA KAY MCMILLENCredential: M.D,

Location Address2350 MEADOWS BLVDCastle Rock, CO 80109-8405

Mailing Address2350 Meadows BlvdCastle Rock, CO 80109-8405 · (720) 455-0350 · Fax (720) 455-0351

Phone(720) 455-0350

Fax(720) 455-0351

Sole ProprietorNo

Medical School CMSUniversity Of Arkansas College Of MedicineGraduated 2014

Enumeration DateDecember 4, 2015

Last NPPES UpdateFebruary 26, 20255 updates tracked since enumeration

NPPES CertifiedFebruary 26, 2025

✔ NPI 1659746477 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in CO · DR0060302

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

2350 MEADOWS BLVD, Castle Rock, CO 80109

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Other Names 1

Former Name (1)Kassandra Thomas

Secondary Practice Location 1

Location 110350 E Dakota AveDenver, CO 80247-1314 · Phone (303) 338-4545

Other Identifiers 2

Other029358CO · Kaiser Commercial Number

Medicaid9000167241CO

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. Kassandra Kay Mcmillen 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 ID345596698

PECOS Enrollment IDI20180629000341

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 Reassignment

Medicare enrollment records show Kassandra Mcmillen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Portercare Adventist Health System

Same address

Obstetrics & Gynecology

2350 MEADOWS BLVD
Castle Rock, CO 80109

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

NPI 1881418796 (720) 455-0350

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 80109 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.

USACS OF COLORADO INC

Emergency Medicine