Michael Ronickher

As lead counsel for Dr. James Taylor, Michael Ronickher represented a Kaiser Permanente physician whose responsibilities had included coding governance, compliance, and revenue-cycle management. Taylor, a longtime physician and former medical director, alleged that Kaiser added and retained diagnosis codes unsupported by patients’ medical records. Developing his case required comparing what clinicians had documented with the codes ultimately submitted for payment, including additions made after a patient’s visit.

The Doctor Who Wouldn’t Let It Go

Medicare Advantage pays health plans monthly amounts adjusted in part for each patient’s diagnoses. A diagnosis associated with greater medical need can increase the patient’s risk score and the plan’s payment. The government alleged that Kaiser sought additions to medical records months, and sometimes more than a year, after appointments, including diagnoses that physicians had neither considered nor addressed during those visits.

The allegations concerned practices from 2009 through 2018. Kaiser allegedly mined patients’ histories for diagnoses, sent physicians requests to add them, and set goals for physicians and facilities to increase risk-adjustment diagnoses. The government also alleged that financial incentives were tied to those goals and that internal warnings and compliance audits had identified improper addenda.

In January 2026, after years of litigation, Kaiser entities agreed to pay the government $556 million to resolve the False Claims Act allegations, the largest Medicare Advantage settlement under the statute at the time. The resolution included claims brought by Taylor and fellow whistleblower Ronda Osinek; their combined relator share was $95 million, among the largest whistleblower recoveries. “Dr. Taylor raised concerns internally long before he went to the government,” Ronickher said. “His persistence and commitment to justice are inspiring.”

Ronickher also served as lead counsel for Teresa Ross, a former Group Health Cooperative employee, in litigation involving Independent Health and its diagnosis-coding subsidiary, DxID. The government alleged that DxID supplied unsupported diagnoses that increased Medicare payments. The December 2024 settlement provided for payments of up to $100 million from Independent Health, DxID, and former DxID chief executive Betsy Gaffney, with part of the amount dependent on Independent Health’s financial performance over five years. Explaining the result, Ronickher emphasized that it included both a vendor and an individual executive: “That’s key for deterrence.”

Nine Years at the Tax Division

Before law school, Ronickher edited pre-med and pre-nursing textbooks for the publisher Benjamin Cummings. He had graduated summa cum laude from Dartmouth College in comparative literature. At Stanford Law School, he graduated with distinction, held a public-interest fellowship, and co-edited the Journal of Civil Rights and Civil Liberties.

He spent roughly nine years as a trial attorney in the Justice Department’s Tax Division, developing tax evidence and taking tax and financial-fraud disputes through trial for the United States. He received the division’s Outstanding Attorney Award in 2010, 2013, and 2015, and his work on the Wells Fargo tax-shelter trial earned an IRS commendation.

After government service, Ronickher built his whistleblower practice at Constantine Cannon, representing insiders with information about tax fraud, health-care payments, and compliance with cybersecurity requirements in federal contracts. He testified before the D.C. Council in 2018 in support of tax provisions in the District’s False Claims Act, which opened local tax fraud to whistleblower enforcement. In 2024, he joined colleagues in launching Whistleblower Partners LLP.

He has written in Fortune, Bloomberg Tax, The Washington Post, and Law360 about whistleblower programs, tax enforcement, and anti-money-laundering policy. Outside his practice, he coaches his daughters’ youth soccer.

A New Theory Every Few Years

In the Cisco Systems litigation, Ronickher represented James Glenn, a network and video-surveillance specialist who had identified security defects in software sold to government agencies. Ronickher explained that someone with limited access could acquire administrative privileges without the creation of that account being logged. Depending on the installation, an intruder could also reach connected physical-security systems, including electronic card readers and alarms.

The case resolved for $8.6 million in 2019, the first successful False Claims Act case based on undisclosed cybersecurity defects in a government-purchased product. In October 2021, the Justice Department launched its Civil Cyber-Fraud Initiative to pursue contractors and grant recipients that knowingly supplied deficient cybersecurity products or services, misrepresented their practices, or violated monitoring and reporting obligations.

In health care, Ronickher represented Dennis Kogod, a former chief operating officer of DaVita Kidney Care. DaVita’s $34.5 million settlement in 2024 resolved three sets of kickback allegations: a transaction tied to pharmacy referrals, uncollected management fees benefiting physician-owners of vascular-access centers, and compensation to a nephrology practice connected to dialysis referrals.

The Last Resort, Made to Work

Ronickher has described whistleblowing as “the last resort for people who find things that just aren't being fixed.” His clients have included a coding-compliance physician, a tax insider, and a network engineer. Their cases require developing specialized knowledge into documentary evidence and a claim under the applicable whistleblower program.

In one confidential IRS matter, Ronickher represented the first whistleblower to expose an offshore structure used in a complex tax fraud. He worked with Chris McLamb and Eric Havian, with assistance from paralegal Karen Yang. The government recovered $263.7 million in taxes, penalties, and interest. His client and two other whistleblowers shared a $79 million award, among the largest in the IRS program’s history.

The IRS recognized information connecting transactions and parties it was unlikely to identify through ordinary examination, along with the whistleblowers’ assistance in the investigation. After the taxpayer had paid and waived further challenges, Ronickher commended the whistleblower office’s collaborative approach to paying the award without years of additional administrative proceedings or litigation.