California is one of the largest and busiest states in the USA. As of January 1, 2025, about 39.5 million people live in California, and this number keeps growing. California has around 413 hospitals and 969 urgent care centers. With so many people and healthcare places, handling medical bills becomes very hard work. This is why hospitals, clinics, and labs need to pick a good medical billing company they can trust.
A good billing partner helps healthcare providers in many ways:
- Get paid faster
- Stop insurance claims from being rejected
- Handle less paperwork
- Follow all the newest insurance rules
In this article, we list the 10 best medical billing companies in California. This will help healthcare practices choose the right billing company more easily.
1. Nexus io
When healthcare providers are drowning in billing headaches, Nexus io throws them a lifeline with its comprehensive medical billing services. Nexus io is one of the medical billing companies that provides its services in California, partnering with over 30 medical specialties and helping practices collect up to 90% of their payments while cutting unpaid accounts by 30%.
From mental health to cardiology, they handle everything including medical billing, credentialing, collections, AR, and compliance. Backed by a team of certified coders holding credentials from AAPC and AHIMA (such as CPC, CCS, and CCA), Nexus io ensures accurate coding, compliance, and specialty-specific expertise. Using smart AI technology and real-time reporting, Nexus io lets doctors do what they do best to focus on patients instead of paperwork and payment struggles. Core strengths of Nexus io include:
- Team of 200+ certified coders from AAPC and AHIMA
- Partners with over 30 medical specialties in California
- Helps collect up to 90% of payments and reduces unpaid accounts by 30%
2. Med Karma
MedKarma is a healthcare revenue cycle management company based in Ontario, California. Founded in 2020, it has quickly grown to serve healthcare providers with customized billing solutions. With a strong focus on accuracy, MedKarma helps reduce claim errors and improve financial performance.
The company is known for its high service quality, shown by a 4.8 Google rating from 16 reviews. According to ZoomInfo, its revenue is around $5 million. MedKarma supports both medical billing companies and providers by simplifying complex administrative tasks and ensuring policy compliance.
3. Certified Healthcare Billing
Certified Healthcare Billing is a trusted medical billing company based in Los Angeles, California, helping healthcare practices across the state since 2011. Certified Healthcare Billing generates around $5 million in annual revenue, according to Zoominfo data.
Certified Healthcare Billing has a great 4.9-star rating on Google and is certified by GSA and HIPAA, which means they follow important rules to keep your data safe. They handle all billing work to help you get paid faster and avoid delays. They send all claims within one day and make sure 97% of those claims are clean and correct. On average, they help doctors earn 25% more. Plus, their team works with all popular EHR systems, so getting started is easy and hassle-free. Key Services Offered:
- Improves cash flow and recovers aging AR to minimize losses.
- Reviews and resubmits denied claims to increase payment success.
- Handles provider enrollment and contracting with insurance payers.
- Posts and verifies payments from ERAs and EOBs for accuracy.
4. Medcare MSO
MedCare MSO, based in Irvine, California, offers expert end-to-end medical billing services for over 50 specialties. With more than 10 years of experience, they use advanced AI and cloud billing to speed up reimbursements and improve efficiency. According to Zoominfo, revenue of this company is $105.7 Million. Their system integrates with major payers for real-time claim updates. MedCare MSO helps lower billing mistakes and save money while growing your income. Medcare MSO uses smart tools to track denied claims and quickly recover unpaid bills. This company also ensures compliance with the latest billing standards and provides 24/7 HIPAA-compliant support.
- 98.5% first pass clean claims rate
- 35% reduction in accounts receivable
- 96% collection ratio
- 30% faster reimbursements and 50% more operational efficiency
5. Doctors One Practice Solutions, LLC
Doctors One Practice Solutions, LLC is a Corona, California-based medical billing company, founded in 2014. With a 5-star Google rating and revenue of around $5 million (as per ZoomInfo), the company focuses on helping healthcare providers increase revenue and reduce billing costs.
Their experienced medical billers and coders work directly with insurance companies to make sure medical billing claims are paid quickly and correctly. They also offer custom monthly financial reports to keep healthcare practices informed and on track. Their key services include:
- This company carefully records and double-checks every charge for office visits, surgeries, lab work, and medical tests to ensure everything is accurate before sending out the bill.
- Sending and tracking claims electronically for faster payments.
- Appealing all denials to get proper reimbursements.
- Following up on all unpaid claims for maximum collections.
6. FCS Medical Billing
FCS Medical Billing is a trusted medical billing company based in Newport Beach, California, with a 5-star Google rating and over $5 million in revenue (according to Zoominfo). Known for its smart and committed team, FCS helps healthcare providers improve their billing processes and increase revenue. Whether you’re an established group or a new practice, FCS brings both technical knowledge and business insights to support your growth and success. Key Services Offered:
- Complete medical billing for clinics and hospitals
- Support for startup practices and solo providers
- Reimbursement optimization through accurate coding and claims
- Practice management and revenue cycle consulting
7. California Medical Billing
Founded in 2001, California Medical Billing & Revenue Management is a trusted partner for doctors across California, helping them boost revenue and focus more on patient care. According to Zoominfo, the revenue of this company is around $5 Million.
With a 98% average collections rate in 2024 and over $34 million collected and continuing with the same ratio in 2025, the company brings years of experience and proven results. Their 100% USA based team ensures transparency, clear communication, and deep understanding of California insurance systems. They offer specialized billing solutions that cut through red tape and simplify your practice’s financial workflow.
- Billing and collections support for practices already using automation
- End-to-end revenue optimization solutions for practices looking to scale
- Full-service support including billing, collections, credentialing, and consulting
- Individual services like credentialing, new practice setup, and RCM consulting
8. Bridge Billing Services
Bridge Billing Services, based in Placerville, California, has been supporting healthcare providers since 2001. With a strong reputation reflected in a 5-star Google rating from 46 reviews and an estimated revenue of around $5 million (Zoominfo), this full-service billing company is known for reliable, personalized support.
Their experienced team works closely with practices, becoming a seamless extension of their staff to ensure steady cash flow and effective communication. They are committed to working every claim aggressively until it’s resolved, helping practices stay financially strong. Services Offered:
- Electronic claim submission to Medicare, Medicaid, and private insurers
- Full-service medical billing and collections
- Consulting services to increase revenue
- Physician credentialing for practices of all sizes
9. CA Billing
CA Billing is a boutique medical billing company based in Newport Beach, California, established in 2016. With a 5-star Google rating and over $5 million in revenue (as per Zoominfo), CA Billing focuses on the behavioral health sector. The company uses a smart and flexible way of working by using real data to help clients keep up with changing billing rules and insurance trends.
Their team keeps updating billing plans to avoid claim denials and make sure clients get paid as much as possible. Backed by real industry data, CA Billing helps behavioral health providers make smarter decisions and recover lost revenue. Their medical billing and collections services include:
- Monitoring and applying the latest industry trends
- Creating payer-specific billing strategies
- Reviewing both current and aged receivables
- Using an aggressive approach for collections
10. A+ Medical Billing
A+ Medical Billing, located in Irvine, California, has over 25 years of experience providing reliable and efficient billing services to healthcare practices. With a 98% claim approval rate, 98% on-time payments, and over $10 million recovered in revenue, they offer billing at just 3%, helping providers boost revenue while staying focused on patient care.
The company is known for its experience, accurate billing, and quick payments. That’s why it has a 5-star rating on Google and makes about $5 million in revenue, according to ZoomInfo.
- Billing services for OBGYN, Pediatrics, Dermatology, Family Medicine, Behavioral Health, and Cosmetic Procedures
- Extra support for bundled codes, routine checkups, and busy medical practices
- Customized solutions for insurance verification, coding, and clean claim submission
Important Questions to Ask Before Hiring a Medical Billing Company
How much will you charge me?
Ask about their fee structure, percentage of collections or fixed fees. Also, check for extra costs like start-up or cancellation fees.
Can you give me references?
Good billing companies share past clients’ contacts or testimonials. They should have experience with practices similar to yours.
Will I own my billing data?
Your data must stay yours, even if you leave the company. You should be able to get all your records anytime.
Is your staff trained and certified?
The team should have proper training and certifications like CPC or professional memberships. They need to keep up with billing updates and rules.
How do you keep patient data safe?
They must follow strict security rules for emails, files, and computers. Make sure they protect patient info and dispose of data securely.
How will you keep me updated?
You should get regular reports about your billing and collections. The company should communicate clearly and keep you involved.
Final Thought
Choosing the right medical billing company is very important for healthcare practices in California. If a practice does not pick a trustworthy billing partner, it can have big problems like late payments, more insurance claim rejections, higher paperwork costs, and losing money. These problems can affect how well patients are cared for and the financial health of the practice.
Finding a good medical billing company in California can be hard because there are many companies and the billing rules are complicated. That’s why we have carefully studied and made a list of the 10 best medical billing companies in California for 2025. We chose these companies based on their services, customer reviews, earnings, and reputation.
Each company on this list has special skills for different healthcare fields and practice sizes. We suggest healthcare providers think about their main needs like specialty knowledge, technology, price, and support before picking a company.
