Open to opportunities

Derrick Onyango

@derrickonyango1

AAPC-certified medical billing and coding specialist specializing in high-accuracy ICD-10/CPT and revenue cycle optimization.

Kenya

Message

What I'm looking for

I’m looking for a role where I can drive 99%+ coding accuracy, strengthen RCM workflows, and actively reduce denials through audits, documentation support, and HIPAA-compliant claims processing—while growing with a team focused on results.

I’m a detail-oriented, AAPC-certified Medical Billing and Coding Specialist focused on ensuring 99%+ coding accuracy and optimizing revenue cycle management (RCM). I’m proficient in ICD-10-CM, CPT, and HCPCS Level II coding systems across diverse medical specialties, with a strong commitment to HIPAA compliance and data integrity.

In my work, I streamline insurance claims processing, strengthen documentation to support the billed level of service, and use denial management to recover revenue. I’ve reduced claim denial rates (including a 5% reduction through pre-submission audits) and increased successfully overturned appeals by 20% while leveraging Epic and Cerner for eligibility verification, prior authorizations, and accurate billing workflows.

Experience

Work history, roles, and key accomplishments

Current

Medical Billing and Coding Specialist

Current

Upwork Client

Jul 2026 - Present (0 months)

Manage full-cycle billing for a multi-specialty healthcare facility, ensuring coding accuracy and compliance. Reduced claim denial rates by 5% and increased overturned appeals by 20% while using Epic/Cerner for eligibility verification, prior authorizations, and billing documentation support.

Medical Coding ICD 10 CM CPT HCPCS Level II E M Coding Denial Management Accounts Receivable Payment Posting Medicare Medicaid Appeals Revenue Cycle Management Eligibility Verification Prior Authorizations Epic Cerner

Medical Billing Assistant / Intern

Upwork Client

Jan 2026 - Jul 2026 (6 months)

Assisted with accurate ICD-10 and CPT coding for outpatient services while maintaining high-volume data entry with zero errors. Communicated with insurance payers to resolve unpaid/pending claims, reducing the A/R cycle by 5 days, and processed patient statements while maintaining HIPAA compliance.

Medical Coding ICD 10 CPT High Volume Data Entry Claims Resolution HIPAA compliance

Education

Degrees, certifications, and relevant coursework

Kaimosi University

Bachelor of Medicine, Clinical Medicine

2004 - 2028

Grade: 3.1

University of Kaimosi

Bachelor of Clinical Medicine and Community Health, Clinical Medicine and Community Health

Pursuing a Bachelor of Clinical Medicine and Community Health, with coursework covering advanced medical coding, healthcare reimbursement, and core medical sciences.