diff --git a/.changelog/16618.txt b/.changelog/16618.txt
new file mode 100644
index 00000000000..94273c6bc98
--- /dev/null
+++ b/.changelog/16618.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_ssm_parameter: Use ARN value from API response rather than generating the value
+```
diff --git a/aws/data_source_aws_ssm_parameter.go b/aws/data_source_aws_ssm_parameter.go
index 9d77076c45c..10039abd244 100644
--- a/aws/data_source_aws_ssm_parameter.go
+++ b/aws/data_source_aws_ssm_parameter.go
@@ -3,10 +3,8 @@ package aws
 import (
 	"fmt"
 	"log"
-	"strings"
 
 	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/arn"
 	"github.com/aws/aws-sdk-go/service/ssm"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
 )
@@ -63,16 +61,9 @@ func dataAwsSsmParameterRead(d *schema.ResourceData, meta interface{}) error {
 	}
 
 	param := resp.Parameter
-	d.SetId(aws.StringValue(param.Name))
 
-	arn := arn.ARN{
-		Partition: meta.(*AWSClient).partition,
-		Region:    meta.(*AWSClient).region,
-		Service:   "ssm",
-		AccountID: meta.(*AWSClient).accountid,
-		Resource:  fmt.Sprintf("parameter/%s", strings.TrimPrefix(d.Id(), "/")),
-	}
-	d.Set("arn", arn.String())
+	d.SetId(aws.StringValue(param.Name))
+	d.Set("arn", param.ARN)
 	d.Set("name", param.Name)
 	d.Set("type", param.Type)
 	d.Set("value", param.Value)
diff --git a/aws/resource_aws_ssm_parameter.go b/aws/resource_aws_ssm_parameter.go
index d577a47bdde..b085eee4080 100644
--- a/aws/resource_aws_ssm_parameter.go
+++ b/aws/resource_aws_ssm_parameter.go
@@ -4,11 +4,9 @@ import (
 	"context"
 	"fmt"
 	"log"
-	"strings"
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/arn"
 	"github.com/aws/aws-sdk-go/service/ssm"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/customdiff"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
@@ -197,14 +195,7 @@ func resourceAwsSsmParameterRead(d *schema.ResourceData, meta interface{}) error
 		return fmt.Errorf("error setting tags: %s", err)
 	}
 
-	arn := arn.ARN{
-		Partition: meta.(*AWSClient).partition,
-		Region:    meta.(*AWSClient).region,
-		Service:   "ssm",
-		AccountID: meta.(*AWSClient).accountid,
-		Resource:  fmt.Sprintf("parameter/%s", strings.TrimPrefix(d.Id(), "/")),
-	}
-	d.Set("arn", arn.String())
+	d.Set("arn", param.ARN)
 
 	return nil
 }
diff --git a/website/docs/index.html.markdown b/website/docs/index.html.markdown
index dad41e5b6e7..581650db962 100644
--- a/website/docs/index.html.markdown
+++ b/website/docs/index.html.markdown
@@ -325,8 +325,6 @@ for more information about connecting to alternate AWS endpoints or AWS compatib
     - [`aws_ses_template` resource](/docs/providers/aws/r/ses_template.html)
     - [`aws_ssm_document` data source](/docs/providers/aws/d/ssm_document.html)
     - [`aws_ssm_document` resource](/docs/providers/aws/r/ssm_document.html)
-    - [`aws_ssm_parameter` data source](/docs/providers/aws/d/ssm_parameter.html)
-    - [`aws_ssm_parameter` resource](/docs/providers/aws/r/ssm_parameter.html)
     - [`aws_vpc` data source](/docs/providers/aws/d/vpc.html)
     - [`aws_vpc` resource](/docs/providers/aws/r/vpc.html)
     - [`aws_vpc_dhcp_options` data source](/docs/providers/aws/d/vpc_dhcp_options.html)