Understanding FHIR Validator Cardinality and Slicing Errors
Decode FHIR validator cardinality and slicing errors — what minimum cardinality not met means, why slices fail, and how to fix each one fast.
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How ICD-10-CM Chapters Are Organized (All 21 Chapters)
Learn how ICD-10-CM chapters are organized: all 21 chapters by body system, their code-letter ranges, coding guidelines, and how coders navigate them.
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HL7 ORU^R01 Test Messages for Lab Interfaces
Build valid HL7 ORU^R01 sample test messages with lab results — OBR/OBX structure, LOINC coding, abnormal flags, and result status for interface validation.
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How to Look Up an ICD-10-CM Code (Step by Step)
Learn how to look up an ICD-10 code the right way: start in the Alphabetic Index, verify in the Tabular List, and confirm a valid, billable 2026 code.
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HL7 MSH Encoding Characters: Pipe, Caret, Tilde
What do the encoding characters in the HL7 MSH segment mean? A field-by-field guide to the pipe, caret, tilde, ampersand and backslash delimiters.
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DICOM Windowing: Window Width and Window Level Explained
Window width window level in CT explained: how DICOM Window Center (0028,1050) and Window Width (0028,1051) map Hounsfield Units to greyscale.
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Troubleshooting MLLP Framing Errors in HL7 v2 Interfaces
Diagnose and fix MLLP framing errors in HL7 v2 interfaces — missing 0x0B start blocks, dropped 0x1C 0x0D trailers, fragmentation, and encoding pitfalls.
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ICD-10-CM Code Structure Explained: How a Code Is Built
A coder's deep dive into ICD 10 code structure: the 3-7 character format, category, decimal, seventh character, placeholder X, with real code examples.
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What Is a FHIR Bundle? Types, Entries, and When Each Is Used
A FHIR Bundle packages resources into one JSON document. Learn the nine Bundle types, entry, fullUrl and request structure, and when each is used.
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How to Open an NDJSON FHIR Bulk Export
Open a .ndjson FHIR bulk export without fighting your editor: what NDJSON is, why one broken line ruins parsing, and how to read per-resource-type files.
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How FHIR References Work: Relative, Absolute, urn:uuid, and Contained
Relative, absolute, urn:uuid and contained FHIR references — how each resolves, how transaction bundles rewrite them, and why unresolved ones break pipelines.
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FHIR Bundle Viewer: How to Inspect a Bundle You Received
A practical checklist for inspecting a FHIR Bundle someone sent you: what to check first, how to follow references, and how to spot unresolved ones.
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