Code generation logic is duplicated across multiple generator files. This creates maintenance issues and inconsistent behavior.

Files affected:

• healthchain/data_generators/conditiongenerators.py
• Other generator files with similar patterns

Current TODO:

# TODO: Factor out the code generation logic to a central place

Problem:
Code generation for FHIR coding systems (creating code/system/display objects) is repeated in multiple generators. This leads to:

• Code duplication
• Inconsistent coding patterns
• Harder to maintain and extend

Goal:
Create centralized code generation utilities that can be reused across all generators.

Acceptance Criteria:

• Identify all places where code generation logic is duplicated
• Create shared utility functions (suggest: healthchain/data_generators/coding_utils.py)
• Refactor existing generators to use shared utilities
• Ensure all existing tests still pass
• Code should support common coding systems (ICD-10, SNOMED CT, LOINC, etc.)

Suggested approach:

# healthchain/data_generators/coding_utils.py
def create_coding(
    code: str,
    system: str,
    display: Optional[str] = None,
    version: Optional[str] = None
) -> dict:
    """Create a standardized FHIR Coding object."""
    coding = {
        "system": system,
        "code": code,
    }
    if display:
        coding["display"] = display
    if version:
        coding["version"] = version
    return coding

# Common system URIs as constants
SNOMED_CT_URI = "http://snomed.info/sct"
ICD10_URI = "http://hl7.org/fhir/sid/icd-10"
LOINC_URI = "http://loinc.org"

Resources:

• Review healthchain/data_generators/basegenerators.py for existing patterns
• FHIR Coding data type
• Search codebase for repeated code generation patterns