German Dental FHIR Profiles (R4) - Local Development build (v0.36.1) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

International Interoperability

International Interoperability

This page describes how the German Dental FHIR Profiles (fhir-dental-de) relate to international dental FHIR specifications and provides guidance for cross-border data exchange.

European Dental FHIR Landscape

As of 2026, only two published dental FHIR Implementation Guides exist in Europe:

No dedicated dental FHIR IGs have been published for Austria, Switzerland, the UK, Norway, or any other European country. The Nordic countries (Norway, Sweden, Denmark) have advanced general eHealth infrastructure but no dental-specific FHIR work. The FDI World Dental Federation published a consensus statement on integrated EHRs in March 2025 advocating FHIR-based interoperability but does not author FHIR IGs.

Comparison with MedMij Dental Care IG (Netherlands)

The MedMij R4 Dental Care IG is maintained by Stichting MedMij and Nictiz. It takes a fundamentally different architectural approach: minimal dental-specific profiles with heavy reliance on shared nl-core base profiles.

Profile Correspondence

Terminology Comparison

Architectural Comparison

Harmonization Opportunities

Despite their different architectures, the two IGs share a common clinical foundation that can be harmonized:

1. SNOMED CT dental mapping — Both IGs use SNOMED CT for clinical concepts. A shared European SNOMED CT dental value set (covering caries risk, oral hygiene, periodontal findings, parafunctional habits) would benefit both IGs and any future European dental IG.

2. Periodontal assessment — fhir-dental-de's granular PeriodontalObservationDE (6-point probing, BOP, recession, furcation) and MedMij's aggregate PeriodicPeriodontalScreeningScore are complementary. An aligned approach could define a base screening level (NL-style PSI) with an optional detailed level (DE-style per-tooth components).

3. Procedure coding bridge — Neither BEMA/GOZ nor Vektis Mondzorg codes are internationally portable. SNOMED CT procedure concepts could serve as a European lingua franca, with national codes as primary bindings and SNOMED CT as secondary (similar to fhir-dental-de's dual-coding strategy for tooth identification).

4. FDI tooth identification — fhir-dental-de already uses FDI (ISO 3950) as the international standard. MedMij does not currently expose tooth-level data. Adopting FDI across both IGs would enable tooth-level data exchange without code system translation.

Profile Correspondence

The following table maps fhir-dental-de profiles to their closest equivalents in the HL7 Dental Data Exchange IG.

Terminology Mapping

Tooth Identification

Germany and most countries use the FDI two-digit notation (ISO 3950). The US uses ADA Universal Numbering. Both can be bridged via SNOMED CT anatomical tooth concepts.

fhir-dental-de uses FDI as the primary coding in bodySite and adds SNOMED CT as a secondary coding where a corresponding concept exists. This dual-coding strategy enables US IG consumers to interpret tooth references without understanding FDI notation.

Tooth Surfaces

Dental surfaces use different code sets across jurisdictions. The concepts are clinically identical but the code systems differ.

fhir-dental-de defines a tooth-surfaces extension (0..*, repeating CodeableConcept) to represent multi-surface findings and procedures (e.g., an MOD restoration). The US IG models multi-surface via multiple SNOMED targetSiteCode values on bodySite.

Procedure Codes

There is no 1:1 mapping between BEMA/GOZ and CDT. The procedure concepts overlap clinically (e.g., "two-surface composite restoration" exists in both systems), but the code structures, numbering, and granularity differ fundamentally. Cross-system mapping requires clinical concept matching, not code translation.

Diagnosis Codes

Both ICD-10 variants share a common stem (WHO ICD-10) but diverge at the extension level. SNOMED CT can serve as a bridge terminology for clinical concepts, though coverage of dental diagnoses varies.

Dual-Coding Strategy

fhir-dental-de uses a dual-coding approach to maintain compatibility with the HL7 Dental Data Exchange IG while preserving native German coding:

1. FDI as primary coding – the standard in German dental practice and internationally (outside the US).
2. SNOMED CT as secondary coding – enables interoperability with the US IG, which uses SNOMED tooth concepts.

Example: bodySite with dual coding

{
  "bodySite": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/ex-tooth",
          "code": "36",
          "display": "Lower left first molar (FDI 36)"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "38671000",
          "display": "Permanent lower left first molar"
        }
      ]
    }
  ]
}

Example: tooth-surfaces extension with dual coding

{
  "extension": [
    {
      "url": "https://fhir.cognovis.de/dental/StructureDefinition/tooth-surfaces",
      "valueCodeableConcept": {
        "coding": [
          {
            "system": "https://fhir.cognovis.de/dental/CodeSystem/tooth-surfaces",
            "code": "M",
            "display": "Mesial"
          },
          {
            "system": "http://snomed.info/sct",
            "code": "245647007",
            "display": "Structure of mesial surface of tooth"
          }
        ]
      }
    }
  ]
}

A system consuming data from fhir-dental-de can ignore the FDI coding and rely solely on the SNOMED CT coding to achieve compatibility with US IG expectations. Conversely, a German system can ignore the SNOMED coding and use FDI directly.

Interoperability Assessment

Compatible (convertible with dual-coding)

• Clinical findings (DentalFindingDE / Dental Finding) – both are Observation-based with bodySite tooth identification. Dual-coded FDI+SNOMED ensures tooth references are interpretable in both directions.
• Clinical conditions (DentalConditionDE / Dental Condition) – both are Condition-based. ICD-10-GM and ICD-10-CM share a common WHO stem; SNOMED CT can bridge remaining gaps.
• Tooth identification – FDI and Universal Numbering both map to SNOMED CT anatomical concepts. The dual-coding strategy in bodySite makes this transparent.
• Communications (DentalCommunicationDE / Dental Communication) – structurally aligned, both based on Communication with dental category.

Partially compatible (same concepts, different code systems)

• Procedures – a two-surface composite restoration is clinically the same concept in BEMA, GOZ, and CDT. The procedure codes differ and cannot be translated mechanically. Cross-border exchange requires mapping at the clinical concept level (e.g., via SNOMED procedure concepts), not code-to-code translation.
• Diagnosis codes – ICD-10-GM and ICD-10-CM diverge at extension digits. Mapping is feasible for common dental diagnoses (e.g., K02.x caries codes share the same stem) but not guaranteed for all codes.

Not compatible (fundamentally different systems)

• Billing – German dental billing (BEMA for GKV, GOZ for PKV) and US dental billing (CDT + insurance claims) are structurally incompatible. Fee calculation (German point values / multiplier factors vs. US fee schedules), insurance workflows (KZV clearing vs. direct payer submission), and authorization processes (HKP Genehmigung vs. prior authorization) have no meaningful overlap. The ChargeItem-based profiles in fhir-dental-de (BemaChargeItemDE, GozChargeItemDE) have no equivalent in the US IG.
• Treatment plan authorization – German HKP/KV workflows (CarePlan-based with KZBV approval) differ fundamentally from US prior authorization (typically modeled via Da Vinci PAS or X12 278).

DACH Region Compatibility

This IG is scoped to the German healthcare system (jurisdiction: DE). However, the clinical profiles are designed to be extensible to the DACH region (Germany, Austria, Switzerland).

What is already DACH-compatible

The following profiles use international coding systems and can be adopted in Austria and Switzerland without modification:

• DentalFindingDE / PeriodontalObservationDE / ProphylaxisObservationDE — FDI tooth numbering (ISO 3950) is used in all three countries. SNOMED CT and LOINC observation codes are internationally valid.
• DentalConditionDE — ICD-10-GM (German modification) shares a common WHO ICD-10 stem with the Austrian and Swiss variants. Dental diagnoses (K00-K14) are largely identical across all three national ICD-10 editions.
• DentalProcedureDE — The Procedure resource structure is country-neutral. Only the code binding (BEMA/GOZ) is Germany-specific.
• DentalImagingStudyDE — DICOM modality codes are international. FDI tooth numbering in series.bodySite works across DACH.
• DentalCommunicationDE — Structurally country-neutral.

What requires national adaptation

Extension strategy

A future DACH dental IG could be structured as:

dach-dental-core (clinical profiles, FDI, SNOMED CT)
├── de-dental (German billing, insurance, TI)
├── at-dental (Austrian billing, ELGA)
└── ch-dental (Swiss billing, EPR)

This IG (fhir-dental-de) could serve as the basis for dach-dental-core by extracting the clinical profiles into a country-neutral layer and keeping the billing/insurance profiles as the de-dental specialization.

Three-Way Comparison

The following table summarizes how the three existing dental FHIR IGs cover key clinical domains:

References

• HL7 Dental Data Exchange IG v2.0.0 (Ballot) – US Realm profiles for dental data exchange
• MedMij R4 Dental Care IG v1.0.0-beta.2 – Dutch dental FHIR profiles
• ADA Tooth Surface Codes (HL7 THO) – US tooth surface terminology
• FDI Two-Digit Notation (ISO 3950) – international tooth numbering standard
• SNOMED CT Dental Concepts – international clinical terminology with dental anatomy concepts
• Da Vinci Prior Authorization Support (PAS) – US prior authorization IG
• German Base Profiles (de.basisprofil.r4) – German FHIR foundation
• FDI EHR Consensus Statement (2025) – FDI advocacy for integrated dental EHRs
• CH Core IG – Swiss FHIR base profiles