Every new California business filing, every dayYZK Medical Billing
YIZHOU PAN, Registered Agent
YZK Medical Billing, operating as YZK LLC, provides medical billing and coding services specializing in hospitalist and urgent care billing. The company is based in Montrose, California, and has a professional website outlining its services.
Filed December 19, 2025 · San Francisco, CA · San Francisco County
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California Secretary of State (bizfile Online) · Entity B20250430445 · Retrieved May 14, 2026
About YZK Medical Billing
YZK LLC was filed in California on December 19, 2025, by owner Yizhou Pan, who also serves as the registered agent. The company is in medical billing and lists a San Francisco principal address. Its domain was registered nearly 11 years before the filing, on April 24, 2015, through Hostopia Canada. The website is a modern WordPress site. We estimate annual revenue between $100K and $1M and a team of 6 to 25 employees. No annual report or EIN on file yet.
- Domain registered 3,892 days before the filing date.
- Owner filed personally as the registered agent.
- Website is a modern WordPress site.
- We estimate revenue of $100K-$1M and 6-25 employees.
- No annual report or EIN on file yet.
- First seen by DayOneLead 146 days after filing.
Compiled from the state record, the company's public web presence, and our own research; revenue, employee, and footprint figures are estimates, not verified financials. Updated August 23, 2026.
One of 300 new businesses registered in San Francisco in December 2025, and the only medical billing business registered there that month.
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Filing Details
Verified Business Profile
Contact Information
Verified Website Profile
We matched this business to its website and pulled the domain's registration (WHOIS) record. Domain age is one of the strongest signals that a filing is a truly new business and not a re-filing or paperwork change.
Frequently Asked Questions
When was YZK Medical Billing registered?
YZK Medical Billing was registered as LLC on December 19, 2025 in California.
Where is YZK Medical Billing located?
YZK Medical Billing is based in San Francisco, CA, 94107, in San Francisco County.
What type of business is YZK Medical Billing?
YZK Medical Billing is classified as a medical billing business.
Does YZK Medical Billing have an EIN on file?
No EIN was found on file for YZK Medical Billing at the time of registration.
Who Sells to This Business
Based on the business category, these service providers typically target this type of business.
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