Providers
All 10 in CO
TAMMY A SWITZER, NP
NPI 1801221569, individual, Parker, CO, Nurse Practitioner
1
Evidence tier
documented action, then payment
- Listed on the CA Medicaid exclusion list since July 7, 2022.
- Medicaid still paid claims in 16 later months, $37,476 in total.
score 95 of 100, rank 206, $37K at stake
Paid after the action
Months in which Medicaid paid claims for this provider after a public action that should have triggered a screening check. This is a record of payments, not a determination that they were improper.
| list | identity check | action date | window closed | months paid after | first | last | paid after | 12 months before |
|---|---|---|---|---|---|---|---|---|
| CA Medicaid exclusion list ca medi-cal suspended & ineligible provider list (july 2026) | Exact NPI, name verified | Jul 7, 2022 | still open | 16 | Sep 2022 | Dec 2023 | $37K | $19K |
National provider registry
From the CMS NPPES Registry, refreshed daily.
| Name | TAMMY A SWITZER, NP |
| Type | Individual, sole proprietor |
| Status | Active |
| NPI issued | September 12, 2013, last updated August 20, 2021 |
| Practice location | 12230 LIONESS WAY, Parker, CO 80134-5603, 720-644-9355 |
| Specialties | Nurse Practitioner (363L00000X, primary, license APN.0990747-NP CO) |
Procedures billed
The specific codes behind the dollars. Medicaid figures come from T-MSIS (2018 to 2024) and are compared with every other provider billing the same code; Medicare figures come from the 2024 physician and supplier file and compare this provider's submitted charge with what Medicare allowed, against the usual ratio for that code.
Medicaid, largest codes
| code | what it is | paid | share | per patient-month | typical | rank among providers | |
|---|---|---|---|---|---|---|---|
| 99309 | Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | $54K | 47% | $35 | $21 (top 5% from $84) | 75th percentile | |
| 99214 | Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | $39K | 34% | $71 | $60 (top 5% from $133) | 62nd percentile | |
| 99310 | Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | $11K | 10% | $38 | $30 (top 5% from $134) | 60th percentile | |
| 99490 | Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | $4K | 4% | $8.55 | $6.11 (top 5% from $38) | 62nd percentile | |
| 80307 | Testing for presence of drug, by chemistry analyzers | $1K | 1% | $15 | $45 (top 5% from $110) | too few months to rank | |
| 80373 | Medicaid service code | $786 | 1% | $17 | $10 (top 5% from $21) | too few months to rank | |
| 80365 | Medicaid service code | $786 | 1% | $17 | $9.14 (top 5% from $23) | too few months to rank | |
| 80362 | Medicaid service code | $786 | 1% | $17 | $11 (top 5% from $28) | too few months to rank |
In this area
10 providers in Douglas County, CO carry an indicator in the public record, with $11.8M at stake between them. The most common is more hours than a day holds, on 9 of them, followed by part of a provider network on 1.
| tier | provider | at stake | why |
|---|---|---|---|
| 3 | CENTER AT LINCOLN, LLC Parker, CO, ranked 2979 | $0 |
|
| 4 | MATTHEW GRZEGOZEWSKI Lone Tree, CO, ranked 7510 | $3.7M |
|
| 4 | JOSEPH LADIKA Highlands Ranch, CO, ranked 7935 | $508K |
|
| 4 | NEDA ARAMI Castle Pines, CO, ranked 9710 | $19K |
|
| 5 | ELIZABETH QUAIFE Parker, CO, ranked 10175 | $741K |
|
| 5 | KATIE KOSTELYK Castle Pines, CO, ranked 10534 | $2.1M |
|
| 5 | MELANIE MORRIS Highlands Ranch, CO, ranked 10709 | $3.9M | |
| 5 | AISLYN NELSON Parker, CO, ranked 11123 | $732K |
Recent enforcement in CO
All releasesDepartment of Justice and HHS-OIG releases for this state, newest first. Each opens in a new tab.
DOJIndictedJun 23, 2026
Colorado Man Charged In Medicaid Fraud Scheme Connected To Arapahoe County Adult Daycare
Omer offered three $500 kickback payments in exchange for referrals of Medicaid beneficiaries for adult daycare, and $10,000 in other kickback payments described as marketing expenses or office supply, to induce beneficiaries to attend Nadina Adult Daycare Center.
DOJCivil settlementNov 24, 2025
Southern Colorado Hospital and Doctors Agree to Pay $650,000 to Resolve Allegations That They Unlawfully Prescribed Opioids and Other Controlled Substances
Three physicians employed by Mt. San Rafael Hospital allegedly issued invalid prescriptions for controlled substances including opioids not for a legitimate medical purpose or outside the usual course of professional practice, and caused claims for those prescriptions to be submitted to Medicare and other federal health care programs.
DOJCivil settlementDec 3, 2024
$2 Million Resolves Kickback Allegations Relating to Denver Neuromonitoring Company
Assure paid remuneration to surgeons through joint venture companies to induce them to order intraoperative neuromonitoring services, resulting in claims submitted to federally funded healthcare programs.
DOJIndictedSep 24, 2024
Seven People Charged With Over $40 Million In Medicare And Medicaid Fraud
Defendants, through genetic testing laboratories they owned and operated, paid kickbacks and bribes to marketing companies for referrals for medically unnecessary genetic testing, resulting in more than $40 million in false and fraudulent claims paid by Medicare and Colorado Medicaid, and three defendants laundered the proceeds.
Referral packet
The packet is a draft for a reviewer. It reads every public record behind this case, states what the records show with a citation for each finding, names the regulation each finding relates to, and lists the ordinary explanations to rule out first. It never asserts intent.