# Is there a crosswalk between the old CCCODE and CCSR1?
**URL:** https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746
**Category:** HEALTH SURVEYS
**Created:** [June 29, 2022, 12:29am UTC](https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746 "2022-06-29T00:29:08Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Ralph\_Bradley](https://forum.ipums.org/u/Ralph_Bradley)
#### Post date: [June 29, 2022, 12:29am UTC](https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746/1 "2022-06-29T00:29:08Z")
When the ICD-10 Classification replaced the ICD-9, MEPS discontinued its Clinical Classification System (CCS) in 2016 named CCCODE. In 2018 it had a new CCS variable CCSR1-CCSR3. Is there a crosswalk accross the two so that we can compare each disease for years after 2016 and years before 2016?
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### Author:  [@Ivan\_Strahof](https://forum.ipums.org/u/Ivan_Strahof)
#### Post date: [July 8, 2022, 3:49pm UTC](https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746/2 "2022-07-08T15:49:12Z")
You can find the [general equivalence mapping](https://www.nber.org/research/data/icd-9-cm-and-icd-10-cm-and-icd-10-pcs-crosswalk-or-general-equivalence-mappings) (GEM) between ICD-9-CM and ICD-10-CM codes on the NBER Public Use Data Archive. Note that one ICD-9-CM code can often translate to several ICD-10-CM codes since the latter codes describe more specific conditions.
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### Author:  [@Ivan\_Strahof](https://forum.ipums.org/u/Ivan_Strahof)
#### Post date: [July 15, 2022, 2:08am UTC](https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746/3 "2022-07-15T02:08:19Z")
A note of caution that comparisons of conditions across the two classifications, even those represented in both the IDD9 and ICD10, are challenging. I’m attaching a slidedeck from the most recent MEPS workshop that covers this issue. Specifically, slide 8 demonstrates an example of how changing to the new coding scheme has affected reporting. You can use the [MEPS data tools website](https://datatools.ahrq.gov/meps-hc) to look at the estimates for other conditions to see how they might be affected by the switch (click medical conditions, number of cases).
Hope this helps.
[3\_Medical Conditions March 2022.pdf](https://forum.ipums.org/uploads/short-url/qjOjiLGCInYhvdDcVGBTThjUfoh.pdf) (683.2 KB)
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### Author:  [@Ralph\_Bradley](https://forum.ipums.org/u/Ralph_Bradley)
#### Post date: [September 9, 2022, 12:06am UTC](https://forum.ipums.org/t/is-there-a-crosswalk-between-the-old-cccode-and-ccsr1/4746/4 "2022-09-09T00:06:17Z")
Thank you Ivan.