Conversation-driven specification and execution of healthcare data generation at scale. Use when building profiles, generating cohorts, creating journeys, batch generation, specifying distributions, or any at-scale data generation task.
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name
generation
description
Conversation-driven specification and execution of healthcare data generation at scale. Use when building profiles, generating cohorts, creating journeys, batch generation, specifying distributions, or any at-scale data generation task.
Generative Framework Skills
Use these skills when building specifications for data generation or executing batch generation.
Quick Reference
Skill
Use When
Location
Profile Builder
Defining population characteristics for batch generation
Create a first-year diabetic journey:
- Initial diagnosis visit with labs
- Metformin prescription
- Quarterly follow-ups with A1c
- Possible titration to second agent
3. Execute Generation
Generate the cohort using this profile and journey
Save as cohort "ma-diabetic-cohort-2025"
Generated cohorts should use statistical distributions that match real-world population characteristics. The goal is realistic synthetic data, not random noise.
How to match a target population:
Identify the source benchmark. For Medicare Advantage, use CMS enrollment statistics (mean age ~72, 55% female, regional mix). For Commercial, use employer-census norms. For Medicaid, use state-level demographics.
Select distribution types that fit the data shape. Age in MA populations follows a roughly normal distribution centered near 72-74 with standard deviation ~7. Cost distributions are log-normal (many low-cost, few high-cost). Chronic condition prevalence uses categorical distributions with rates from CDC PLACES or CMS Chronic Conditions data.
Parameterize from published statistics. Do not guess distribution parameters. Use published prevalence rates (e.g., 27% diabetes in Medicare, 14% heart failure) and demographic breakdowns. PopulationSim data (skills/populationsim/) provides county- and tract-level benchmarks for prevalence and social determinants.
Validate output against inputs. After generation, confirm the cohort's statistical profile (mean, median, standard deviation, category proportions) matches the specification within an acceptable tolerance. Flag drift greater than 5% from target parameters.
All generated data is synthetic and fictional. HealthSim produces simulated test data only. Never present generated records as real patient data.
No clinical advice. Generated data must not be used to make prescribing decisions, diagnoses, or treatment recommendations. If asked, remind the user this is synthetic test data, not real clinical information.
Real codes, synthetic entities. Use real, valid medical code systems for realism (see below), but all patients, members, encounters, and claims are generated/fictional.
No real PHI. Never pull from or reference real patient databases. All person-level data is simulated.
Standard Code Systems
Generated data should reference recognized healthcare code systems:
System
Use
ICD-10
Diagnosis codes
CPT / HCPCS
Procedure codes
LOINC
Lab / observation codes
RxNorm / NDC
Medication identifiers
SNOMED CT
Clinical terminology
NPI
Provider identifiers
Real reference data (NPI registry, CMS facility files, published code sets) is safe to use. Synthetic data is generated for all patient/member-level entities.
Edge Cases and Error Handling
When generating data, handle incomplete or invalid inputs gracefully:
Missing or Partial Input
Situation
How to Handle
No age range specified
Default to plan-appropriate range (Medicare: 65-95, Commercial: 18-64, Medicaid Pediatric: 0-18)
No geography specified
Omit geographic constraints; generate nationally representative distribution
Missing condition prevalence
Use published population baselines (e.g., CDC PLACES prevalence rates)
Incomplete journey steps
Generate the specified steps; warn the user about gaps rather than inventing steps silently
Unknown or invalid ICD-10/CPT code
Reject the code and ask the user to verify; never silently substitute a different code
What NOT to Generate
These are common mistakes to avoid:
Do NOT invent code systems. Use only recognized systems (ICD-10, CPT, HCPCS, LOINC, RxNorm, NDC, SNOMED CT, NPI). Never fabricate codes that look plausible but do not exist in the standard.
Do NOT generate clinically impossible combinations. Example: a 5-year-old with Medicare Fee-for-Service, or a pregnancy diagnosis on a male patient. Cross-check age, sex, and plan type against clinical plausibility.
Do NOT silently drop requested attributes. If the user asks for 10 fields and only 8 can be generated, surface the gap explicitly rather than returning incomplete records without explanation.
Do NOT extrapolate beyond the specification. If the user asks for "50 patients with diabetes," generate exactly 50 with diabetes -- do not add additional unrequested conditions for "realism" unless the user has opted into realistic comorbidity modeling.
Do NOT generate duplicate identifiers. Every patient ID, member ID, encounter ID, and claim ID must be unique within a cohort.
Validation Checklist
Before returning generated data, verify:
All code values exist in their respective standard (ICD-10, CPT, LOINC, etc.)
Date sequences are chronologically consistent (admission before discharge, prescription before fill)
Demographic fields are internally consistent (age matches date of birth, plan type matches age eligibility)
Requested counts match output counts (if 200 members requested, 200 are returned)
No duplicate identifiers exist across the generated dataset
