I’m building a focused medical billing and coding application and the first milestone is a rock-solid claims management module that can push electronic claims straight to the clearinghouse. Your daily work will revolve around ICD-10, CPT and modifier logic, so hands-on familiarity with those code sets is essential. I need to see evidence—screenshots, repos, live URLs—of projects where you have already embedded medical coding into a workflow or processed ANSI X12 837 files. Core scope The immediate goal is electronic claim submission: mapping clinical encounters to the correct ICD/CPT combinations, packaging the 837, and handling the 999/277CA acknowledgements. If you have previously added extras such as automated code matching or audit/reporting tools, mention them; they may become phase-two items. Tech expectations You choose the stack, but RESTful APIs, HL7/FHIR awareness, secure database design, and HIPAA-compliant handling of PHI all need to be second nature. Re-use of proven open-source libraries is fine as long as licensing stays commercial-friendly. Deliverables (for this milestone) • A deployable claims management service that submits 837 files electronically • Real-world ICD, CPT, and modifier lookup integrated into the UI or API • Basic dashboard showing submission status and clearinghouse responses • Setup docs and a brief video walk-through When you bid, tell me exactly where in your past work you touched ICD codes, CPT codes or modifiers, and attach or link to a running demo if possible.