Providers
All 10 in CO
MATTHEW CHARLES GRZEGOZEWSKI
NPI 1417163536, individual, Lone Tree, CO, Emergency Medicine
4
Evidence tier
structure or single-organization volume
- Hours beyond a day in 15 months, but with up to 365 patients a month, which points to a supervising clinician on the claims rather than one person's hours.
- Records needed.
- Medicaid dollars per patient on code 99214 ($570 per patient-month) sit in the top 5% of every provider billing that code.
score 56 of 100, rank 7510, $3.7M at stake
Hours billed per day
Medicaid billing converted into hours of hands-on care per day. The lower bound counts one unit per claim line and needs no price; the other two divide dollars by a unit price, the conservative one at 1.5 times the price. The clinician on the claim may be a supervisor under state rules, so billing organizations are counted too.
| month | what was found | hours per day, lower bound | hours per day, at price | hours per day, conservative | per working day | patients | billing organizations | codes | paid |
|---|---|---|---|---|---|---|---|---|---|
| Jan 2022 | More hours than a day holds at a conservative unit price | 3.7 | 49.8 | 33.2 | 49.0 | 310 | 1 | 99202 99203 99212 99213 99214 | $190K |
| Feb 2022 | More hours than a day holds at a conservative unit price | 3.4 | 45.5 | 30.3 | 42.5 | 243 | 1 | 99203 99212 99213 99214 | $151K |
| Mar 2022 | More hours than a day holds at a conservative unit price | 3.8 | 47.8 | 31.8 | 42.9 | 277 | 1 | 99203 99213 99214 | $172K |
| Apr 2022 | More hours than a day holds at a conservative unit price | 3.8 | 48.6 | 32.4 | 46.3 | 274 | 1 | 99203 99213 99214 | $169K |
| May 2022 | More hours than a day holds at a conservative unit price | 3.1 | 41.9 | 28.0 | 39.4 | 245 | 1 | 99203 99213 99214 | $151K |
| Jun 2022 | More hours than a day holds at a conservative unit price | 2.8 | 38.0 | 25.3 | 34.6 | 215 | 1 | 99203 99212 99213 99214 | $134K |
| Aug 2022 | More hours than a day holds at a conservative unit price | 2.9 | 40.1 | 26.8 | 36.1 | 234 | 1 | 99203 99212 99213 99214 | $147K |
| Sep 2022 | More hours than a day holds at a conservative unit price | 3.5 | 46.3 | 30.9 | 42.1 | 261 | 1 | 99213 99214 | $160K |
| Oct 2022 | More hours than a day holds at a conservative unit price | 3.4 | 45.1 | 30.1 | 44.4 | 259 | 1 | 99213 99214 | $161K |
| Nov 2022 | More hours than a day holds at a conservative unit price | 4.9 | 68.5 | 45.6 | 62.2 | 365 | 1 | 99202 99213 99214 | $240K |
| Dec 2022 | More hours than a day holds at a conservative unit price | 4.7 | 54.9 | 36.6 | 51.6 | 315 | 1 | 99213 99214 | $195K |
| Jan 2023 | More hours than a day holds at a conservative unit price | 3.3 | 38.9 | 25.9 | 36.5 | 230 | 1 | 99213 99214 | $135K |
| Feb 2023 | More hours than a day holds at a conservative unit price | 3.8 | 46.8 | 31.2 | 43.7 | 248 | 1 | 99213 99214 | $147K |
| Mar 2023 | More hours than a day holds at a conservative unit price | 4.0 | 50.2 | 33.5 | 45.1 | 279 | 1 | 99213 99214 | $175K |
| Apr 2023 | More hours than a day holds at a conservative unit price | 3.9 | 50.3 | 33.5 | 50.3 | 277 | 1 | 99213 99214 | $171K |
National provider registry
From the CMS NPPES Registry, refreshed daily.
| Name | MATTHEW CHARLES GRZEGOZEWSKI (also MATTHEW GRZEGOZEWSKI) |
| Type | Individual |
| Status | Active |
| NPI issued | May 15, 2007, last updated July 2, 2015 |
| Practice location | 10101 RIDGEGATE PARKWAY, Lone Tree, CO 80124-9810, 720-225-1900 |
| Mailing address | PO BOX 173862, Denver, CO 80217-3862 |
| Specialties | Emergency Medicine (207P00000X, license D66242 MD) Emergency Medicine (207P00000X, primary, license DR.0052852 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 | |
|---|---|---|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | $2.5M | 62% | $559 | $44 (top 5% from $110) | 100th percentile | |
| 99214 | Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | $750K | 18% | $570 | $60 (top 5% from $133) | 100th percentile | |
| 99283 | Emergency department visit with low level of medical decision making | $274K | 7% | $327 | $60 (top 5% from $193) | 99th percentile | |
| 99212 | Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | $223K | 5% | $437 | $28 (top 5% from $147) | 99th percentile | |
| 99203 | New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | $93K | 2% | $499 | $67 (top 5% from $121) | 100th percentile | |
| 99202 | New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more | $64K | 2% | $418 | $45 (top 5% from $138) | 100th percentile | |
| 99284 | Emergency department visit with moderate level of medical decision making | $63K | 2% | $225 | $86 (top 5% from $224) | 95th percentile | |
| 99285 | Emergency department visit with high level of medical decision making | $35K | 1% | $117 | $100 (top 5% from $264) | 65th percentile |
Medicare Part B 2024, largest codes
| code | what it is | services | beneficiaries | paid | submitted per service | allowed per service | charge to allowed | usual for this code |
|---|---|---|---|---|---|---|---|---|
| 99285 | Emergency department visit with high level of medical decision making | 11 | 11 | $1K | $2K | $173 | 11.2x | 6.9x (90th percentile 11.7x) |
A submitted charge many times the allowed amount is common and lawful; it matters when it is far above what other providers submit for the same code.
In this area
10 providers in Douglas County, CO carry an indicator in the public record, with $8.1M at stake between them. The most common is more hours than a day holds, on 8 of them, followed by paid after a public list action on 1. 1 is tier 1: documented action, then payment.
| tier | provider | at stake | why |
|---|---|---|---|
| 1 | TAMMY SWITZER Parker, CO, ranked 206 | $37K |
|
| 3 | CENTER AT LINCOLN, LLC Parker, CO, ranked 2979 | $0 |
|
| 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.