The PDD (PhilHealth Dialysis Database) identifier, also referred to as the PDD Registration Number, is a unique identifier assigned to patients registered in the PhilHealth Dialysis Database. This database tracks individuals diagnosed with Chronic Kidney Disease (CKD) Stage 5 who are undergoing hemodialysis, peritoneal dialysis, or other renal replacement therapies.

While the official circulars (such as PhilHealth Circular No. 24-2015 and 2016-007) describe the purpose and implementation of the PDD, they do not explicitly detail the exact structure or format of the PDD identifier 1 2.

However, based on the NHDR Implementation Guide 3, the PDD Registration Number is treated as a structured data element within the PhilHealth health information systems. It is likely composed of:

• Prefix or code indicating the registration type or system (e.g., "PDD")
• Year or date component indicating the registration year
• Sequential or unique numeric code for the patient
• Possibly region or facility code to identify the registering institution

• Key Elements Table
• Differential Table
• Snapshot Table
• Statistics/References
• All

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value	Σ	0..1	string	PDD Registration No. Example General: 123456 Example PDD Registration No.: 1234567
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
Identifier.use	required	IdentifierUse http://hl7.org/fhir/ValueSet/identifier-use|4.0.1 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())

This structure is derived from Identifier

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
system		1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value		0..1	string	PDD Registration No. Example PDD Registration No.: 1234567
Documentation for this format

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value	Σ	0..1	string	PDD Registration No. Example General: 123456 Example PDD Registration No.: 1234567
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
Identifier.use	required	IdentifierUse http://hl7.org/fhir/ValueSet/identifier-use|4.0.1 From the FHIR Standard
Identifier.type	extensible	Identifier Type Codes http://hl7.org/fhir/ValueSet/identifier-type From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

Key Elements View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value	Σ	0..1	string	PDD Registration No. Example General: 123456 Example PDD Registration No.: 1234567
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
Identifier.use	required	IdentifierUse http://hl7.org/fhir/ValueSet/identifier-use|4.0.1 From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())

Differential View

This structure is derived from Identifier

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
system		1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value		0..1	string	PDD Registration No. Example PDD Registration No.: 1234567
Documentation for this format

Snapshot View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Identifier		0..*	Identifier	An identifier intended for computation
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
use	?!Σ	0..1	code	usual | official | temp | secondary | old (If known) Binding: IdentifierUse (required): Identifies the purpose for this identifier, if known .
type	Σ	0..1	CodeableConcept	Description of identifier Binding: Identifier Type Codes (extensible): A coded type for an identifier that can be used to determine which identifier to use for a specific purpose.
system	Σ	1..1	uri	The namespace for the identifier value Fixed Value: urn://example.com/ph-core/fhir/NamingSystem/pdd-registration-ns
value	Σ	0..1	string	PDD Registration No. Example General: 123456 Example PDD Registration No.: 1234567
period	Σ	0..1	Period	Time period when id is/was valid for use
assigner	Σ	0..1	Reference(Organization)	Organization that issued id (may be just text)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
Identifier.use	required	IdentifierUse http://hl7.org/fhir/ValueSet/identifier-use|4.0.1 From the FHIR Standard
Identifier.type	extensible	Identifier Type Codes http://hl7.org/fhir/ValueSet/identifier-type From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from Identifier

Summary

Mandatory: 1 element
Fixed: 1 element