Best medical billing companies in California

Introduction

Success as a medical provider in California hinges on balancing patient growth with financial sustainability. With continually evolving coding standards, payer policy variability, and state-specific regulations, managing revenue cycle functions internally can quickly strain internal resources. Outsourcing billing to a reputable partner can reduce operational costs, improve cash flow, lower claim denials, and allow staff to refocus on patient care. Whether you operate a solo practice in San Diego, an urgent-care chain in Los Angeles, or a multi-specialty group in the Bay Area, you need a billing partner experienced in both national best practices and California’s unique payer landscape.

Our goal here is to present the first best Credex healthcare and the rest 9 best medical billing companies in California for 2025.

About Credex Healthcare

Credex Healthcare has supported providers nationwide for over 12 years, filing more than 120,000 credentialing applications to streamline billing and credentialing workflows—from solo clinics to large hospital systems. Leveraging HIPAA-compliant systems, dedicated account support, and comprehensive payer expertise, we optimize your revenue cycle with accuracy and efficiency.

By utilizing our mix of HIPAA-compatible systems, individual account service, and payer proficiency, we will make your revenue cycle as effective and inaccuracy-free as possible.

Our Work:

• Enrollment & Maintenance: In-depth research and application submission to Medicare, Medicaid and all the major commercial payers.
• Claims Management: Proper coding, proper submission, strong follow up and smooth processing of the claims.
• Accounts Receivable (AR) Optimization: Specific initiatives to decrease the days in AR and to increase cash collection.
• Credentialing & Revalidation: Annual maintenance, establishment of CAQH, enrollment in PECOS, and credentialing of telemedicine.
• Compliance Advisory & Training: Auditing of workflow, training of the staff on a particular state regulation as well as contract negotiation assistance.

Partnering with Credex Healthcare means that you have chosen to have a partner that will ensure you have fewer denials, faster reimbursements and hence better practice profitability. 

Now, let’s dive into our top picks for medical billing companies in California in 2025.

1. Credex Healthcare: Best Overall Medical Billing Company in California

Credex Healthcare tops our list for a reason. Known nationwide for its insurance credentialing services, Credex offers a full suite of California medical billing services tailored to small clinics, large hospitals, and everything in between.

Key Features:

• Full medical billing, credentialing, and contract negotiation
• Medicare, Medicaid, and commercial payer enrollments
• PECOS & CAQH setup
• HIPAA-compliant platforms
• Personalized account managers

Why It’s the Best:

• 12+ years of experience with over 120,000 applications filed
• Trusted by solo providers, group practices, labs, urgent care, and SNFs
• Fast onboarding and superior support

Credex Healthcare isn’t just a billing company; it’s a true revenue partner for healthcare companies in California.

2. California Medical Billing Services, Inc.

Located in Irvine, this company offers end-to-end medical billing services in California for all practice sizes.

Highlights:

• Specializes in dermatology, pediatrics, and internal medicine
• Transparent reporting and compliance assurance
• Electronic claim submissions

Ideal For:

• Clinics that want full visibility into their revenue cycle
• Small practices wanting to scale

3. Billing Advantage California

Billing Advantage has over 25 years of experience and a strong presence in California. They offer both medical billing and mental health billing services.

Features:

• HIPAA-compliant, cloud-based billing software
• Experienced coding team
• AR cleanup and denial management

Why Choose Them:

• Tailored solutions for telemedicine and behavioral health providers

4. Medwave Healthcare Billing Services

A full-service medical billing company in California that supports specialty clinics and large physician groups.

Services Offered:

• Charge entry, coding, payment posting, denial resolution
• Credentialing and prior authorizations
• Real-time revenue dashboards

Who Should Consider Medwave:

• Practices needing RCM overhaul
• Clinics struggling with high denial rates

5. West Coast Medical Billing

Serving providers from Holly Alvarez, West Coast Medical Billing offers niche billing services for urgent care, orthopedics, and radiology.

Benefits:

• In-depth payer knowledge of California’s local insurers
• Quick onboarding and integrations with top EMRs
• Clear monthly reporting

Perfect For:

• Busy urgent care centers needing California medical billing services

6. Trillium Medical Billing

Based in San Jose, Trillium is known for boutique-style customer service and compliance-driven solutions.

Why It Stands Out:

• Handles both medical billing and medical transcription
• High accuracy rates in claim submissions
• Specialists in internal medicine, family practice, and OB/GYN

Best Fit For:

• Mid-sized clinics wanting a hands-on partner

7. OC Billing Services

With more than 20 years in the business, OC Billing is a trusted name for medical billing services California wide.

Service Suite:

• Claims processing, credentialing, collections
• Medicare audits & compliance support

Why Clients Stay:

• Dedicated account reps
• Fair pricing and easy reporting tools

8. UControl Billing California

This tech-forward billing company offers EHR integration, reporting tools, and RCM services customized for California providers.

Top Features:

• Focus on home health and mental health billing
• Analytics dashboard for claim status and KPIs
• Monthly performance reviews

Best For:

• Data-driven practices seeking automation

9. ProMD Medical Billing Solutions

ProMD is a national firm with a strong California division that supports multispecialty practices and surgical centers.

Why Choose ProMD:

• Real-time eligibility verification
• AR cleanup services and payer negotiations
• HIPAA-compliant claims infrastructure

Who They Serve:

• Clinics scaling fast in 2025

10. MediClaims California

MediClaims focuses exclusively on California medical billing, with expert teams in LA, Fresno, and the Bay Area.

What Sets Them Apart:

• 24/7 support for high-volume practices
• Multilingual support teams
• Excellent with Medi-Cal and Covered California plans

Recommended For:

• Bilingual clinics
• Providers looking to expand insurance coverage options

How to Choose the Right Medical Billing Company in California

Specialty Alignment: Does the company have experience with your practice type—e.g., urgent care, OB/GYN, cardiology, behavioral health? 

• Regulatory Compliance: Are they up-to-date with both CMS and California-specific billing requirements? 

• Technology Capabilities: Do they offer real-time dashboards, claims tracking, and seamless EHR integration? 

• Support Structure: Is a dedicated account manager provided, and how responsive is the support team? 

• Transparent Pricing: Are fees clearly structured—percentage-based, flat-rate, and are contracts presented upfront? 

Local Payer Knowledge: Do they understand California-specific payers, such as Medi-Cal and regional plans, whether local or remote? 

Conclusion

Selecting the right medical billing partner in California is pivotal to improving your revenue cycle performance. All companies featured offer meaningful value; however, Credex Healthcare distinguishes itself through its precision, rapid onboarding, and nationwide credentialing expertise. Whether you operate a boutique practice or a large health system, partnering with the right billing provider allows you to prioritize patient care while optimizing revenue.

Are you Prepared to adjust your Revenue Process?

Get the help of Credex Healthcare to simplify your practices, maximize your collections, and decrease denials. We can go national and excel locally in California through our available experience and scale within the state.

We can be reached today to get started or ask for a free consultation.

FAQS

1. How much do California medical billing services cost?

Most billing companies depend on a percentage of collections (4%-8% or a set monthly fee, depending on what you collect and the services). Buy a quote that suits your practice type and size.

2. Are these billing services HIPAA-compliant?

It is true, but only reputable medical billing firms in California use systems that comply with HIPAA to protect patient information and meet legal requirements under federal and state laws.

3. Do these companies support Medi-Cal billing?

Absolutely. Leading California medical billing companies such as Credex Healthcare and MediClaims have extensive experience with Medi-Cal, Covered California, and regional payer systems. This helps ensure accurate submissions and reduces rejection rates.

4. Can these billing services integrate with my EHR or EMR system?

Yes, most modern billing companies offer EHR/EMR integration that enables automation of patient information, claims processing, and reporting.

5. Do I need a local billing company, or can I use one remotely?

While many practices search for “medical billing companies near me,” both local and remote providers can be effective. The key is to select a company with California-specific payer knowledge and a responsive support team.