Was Nephrology Associates hit by ransomware?

Nephrology Associates was listed by the thegentlemen ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the thegentlemen ransomware group?

thegentlemen is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Nephrology Associates breach?

thegentlemen published data attributed to Nephrology Associates. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Nephrology Associates

Claimed by Thegentlemen · listed 3 months ago

Age

since listed · data leaked

Status timeline

ListedMar 6, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Mar 6, 2026

About the victim

AI dossier — public-source company profile

Nephrology Associates (Nephrology Associates, M.D., PA) is a multi-physician nephrology practice serving the greater Kansas City area since 1979. The practice operates eight offices across Kansas and Missouri, partners with eight hospitals, and provides services at numerous outpatient dialysis facilities. Its interdisciplinary team of nephrologists and nurse practitioners treats conditions including chronic kidney disease, end-stage renal disease, hypertension, and post-transplant kidney care.

Industry: Nephrology / Specialty Kidney Care
Address: 8919 Parallel Parkway, Suite 455E, Kansas City, KS 66112
Founded: 1979

Attack summary

Severity: critical — Nephrology Associates is a specialty medical practice handling highly sensitive protected health information (PHI) for patients with chronic kidney disease and related conditions. The disclosed status is data_published, meaning regulated medical and PII data for patients is likely publicly exposed, meeting the critical threshold for confirmed exfiltration of medical/regulated data at scale.

The ransomware group 'thegentlemen' claims to have attacked Nephrology Associates and the disclosure status is listed as data_published, indicating exfiltration and/or publication of data; the truncated leak post does not provide specific detail on the nature or volume of data published.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Patient personal identifying information
Clinical treatment data
Staff and provider information
Billing and financial records

What the group claims

nephkc.com zoominfo.com/c/nephrology-associates/469726875 Nephrology Associates prides itself on providing the highest quality of care for patients with kidney disorders in the Kansas City area

The leak post

captured from the group's site

Gentlecloud Protection 🛡️ Gentlecloud Verifying your browser... Initializing security checks... I'm not a bot

Sources

Victim sitenephkc.com
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 3 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 483 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 11, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

March 6, 2026Nephrology Associates listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 483 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,780 disclosures indexed across all operators we track. Geographically, Nephrology Associates is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Nephrology Associates appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on thegentlemen's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.