The FY 2027 ICD-10-CM update is here, and medical coders, CDI specialists, billers, auditors, CPC students, and healthcare professionals should start preparing now.
The new ICD-10-CM 2027 codes become effective October 1, 2026, and they apply to patient encounters and discharges from October 1, 2026, through September 30, 2027. The official FY 2027 files are available through CMS and CDC, including the code tables, Index, Tabular List, Addendum, conversion table, and official coding guidelines.
For FY 2027, the released update includes:
- 190 new ICD-10-CM codes
- 30 deleted codes
- 4 revised code descriptions
The biggest theme of this year’s update is greater clinical specificity. Many changes give coders more specific choices for anatomy, laterality, disease type, genetic conditions, pregnancy conditions, toxic exposures, and personal history.
Let’s break down the most important ICD-10-CM 2027 updates in simple language.
ICD-10-CM 2027 Effective Date
The FY 2027 ICD-10-CM code set is effective:
October 1, 2026 – September 30, 2027
This is important because ICD-10-CM follows the federal fiscal year rather than the calendar year.
For example:
- September 30, 2026 → use the applicable FY 2026 code set
- October 1, 2026 → start using FY 2027 ICD-10-CM
CMS states that the FY 2027 ICD-10-CM files are intended for patient encounters and discharges occurring from October 1, 2026 through September 30, 2027. (CMS)
FY 2027 ICD-10-CM Update: Quick Summary
| Change | FY 2027 |
| New ICD-10-CM codes | 190 |
| Deleted codes | 30 |
| Revised code descriptions | 4 |
| Effective date | October 1, 2026 |
| Code year ends | September 30, 2027 |
The official CMS page provides the complete FY 2027 code tables, Tabular List, Index, Addendum, conversion table, and coding guidelines. (CMS)
1. New Secondary Cancer Codes
One important area of the FY 2027 ICD-10-CM update is secondary malignant neoplasm coding.
New codes provide more specific documentation for metastatic cancer involving particular anatomical sites.
Examples include:
- C78.31 – Secondary malignant neoplasm of larynx
- C78.32 – Secondary malignant neoplasm of pharynx
- C79.83 – Secondary malignant neoplasm of oral cavity
These additions allow the coder to identify the metastatic site more precisely instead of relying on a less-specific code.
Easy way to remember
Think:
Metastatic cancer + specific site = check the new C78/C79 options.
This is especially important for oncology coding and for coders working with complex cancer documentation. (ACDIS)
2. New Pelvic Disease Codes
FY 2027 introduces a new category:
K6A – Diseases of the pelvis, not elsewhere classified
Examples include:
- K6A.01 – Prevesical abscess
- K6A.09 – Other pelvic abscess
- K6A.8 – Other diseases of the pelvis, not elsewhere classified
The important coding lesson is simple:
Do not automatically use an unspecified abscess code when the documentation supports a specific pelvic site.
Always check the Alphabetic Index and Tabular List for the most specific code.
3. Odontogenic Sinusitis Gets New Codes
Another useful FY 2027 addition is the new J34.83- category for odontogenic sinusitis.
New codes identify the affected sinus:
- J34.830 – Odontogenic sinusitis, maxillary sinus
- J34.831 – Odontogenic sinusitis, ethmoid sinus
- J34.832 – Odontogenic sinusitis, frontal sinus
- J34.833 – Odontogenic sinusitis, sphenoid sinus
- J34.839 – Odontogenic sinusitis, unspecified
Coding tip
When documentation says odontogenic sinusitis, look for the specific sinus involved.
For example:
Odontogenic sinusitis involving the maxillary sinus → J34.830
The new codes improve anatomical specificity. (ACDIS)
4. Plantar Fasciitis Gets New ICD-10-CM Codes
This is one of the changes many outpatient and orthopedic coders should remember.
FY 2027 introduces the M67.A- category for plantar fasciitis.
Examples include:
- M67.A01 – Plantar fasciitis, right foot
- M67.A02 – Plantar fasciitis, left foot
- M67.A09 – Plantar fasciitis, unspecified foot
There are also more specific codes related to plantar fascial fibromatosis.
Easy memory trick
M67.A = Plantar fasciitis
And when the documentation provides laterality:
Right → M67.A01
Left → M67.A02
Unspecified → M67.A09
This is a good example of ICD-10-CM moving toward greater specificity. (ACDIS)
5. Dilated Cardiomyopathy Gets More Specific
Cardiology coding also receives important changes.
The previous broad code:
I42.0 – Dilated cardiomyopathy
is expanded into more specific choices.
The new codes include:
- I42.00 – Dilated cardiomyopathy, unspecified
- I42.01 – Familial-genetic dilated cardiomyopathy
- I42.09 – Other dilated cardiomyopathy
This means documentation becomes even more important.
Coder’s lesson
If the provider documents:
Familial/genetic dilated cardiomyopathy
you should not simply select an unspecified cardiomyopathy code.
Always check whether the provider documented the specific etiology.
6. Qualitative Platelet Defects: D69.1 Changes
Another important change occurs in the blood disorder chapter.
The broad code:
D69.1 – Qualitative platelet defects
is reorganized into more specific codes.
New options include:
- D69.11 – Glanzmann thrombasthenia
- D69.19 – Other qualitative platelet defects
This provides a clearer distinction between Glanzmann thrombasthenia and other qualitative platelet disorders.
Remember
D69.11 → Glanzmann thrombasthenia
D69.19 → Other qualitative platelet defects
This is an excellent example of why coders should not continue using an old broad code simply because it appears familiar.
7. Postprocedural Hypoglycemia Codes
FY 2027 also adds new codes for hypoglycemia occurring after a procedure.
Examples include:
- E89.83 – Postprocedural hypoglycemia
- E89.830 – Post-bariatric hypoglycemia
- E89.838 – Other postprocedural hypoglycemia
These codes allow coders to distinguish post-bariatric hypoglycemia from other postprocedural hypoglycemia.
Coding tip
Look carefully at the documentation:
Was the hypoglycemia related to bariatric surgery?
If yes, check the specific post-bariatric option.
If another procedure caused the condition, check the appropriate other postprocedural code.
8. Pregnancy Coding: Major Expansion
Pregnancy and obstetric coding receives a significant number of new codes in FY 2027.
One large group of additions involves continuing pregnancy after vanishing twin syndrome, under category O31.4-.
According to the FY 2027 release information, 33 new codes are associated with this category. (ACDIS)
This is an important reminder for OB/GYN and maternal-fetal medicine coders:
Do not code pregnancy conditions from memory.
Always verify:
- Trimester
- Number of fetuses
- Specific pregnancy complication
- Documentation of the vanishing twin
- Applicable Tabular List instructions
Pregnancy codes can be highly detail-dependent, so the Index alone should never be your final coding step.
9. Toxic Effect Codes Become More Specific
Chapter 19 also receives substantial changes.
New code families provide more specific reporting for toxic effects of different substances, including alkenes and cycloparaffins.
For example, new alkenes codes include:
- T52.811A – Toxic effect of alkenes, accidental, initial encounter
- T52.812A – Toxic effect of alkenes, intentional self-harm, initial encounter
- T52.813A – Toxic effect of alkenes, assault, initial encounter
- T52.814A – Toxic effect of alkenes, undetermined, initial encounter
The same encounter concepts extend to subsequent encounter and sequela codes where applicable.
Easy way to learn toxic-effect changes
Think about two things:
1. What substance?
2. What intent/encounter?
Then verify the complete code in the Tabular List.
10. New BMI Codes
FY 2027 adds additional BMI codes for adults.
Examples include:
- Z68.18 – BMI 18.4 or less, adult
- Z68.19 – BMI 18.5–19.9, adult
These additions provide greater specificity for BMI documentation.
Remember that BMI codes are generally additional codes and should be assigned according to the applicable documentation and coding guidelines.
11. New Gender-Related History Codes
FY 2027 also introduces more specific codes for certain gender-related history information.
Examples include:
- Z87.8901 – Personal history of social gender transition
- Z87.8902 – Personal history of medical gender transition
- Z87.8903 – Personal history of surgical gender transition
- Z87.8904 – Personal history of intersex surgery
- Z87.8909 – Personal history of unspecified gender transition
- Z87.893 – Personal history of gender detransition
There is also a new F64.A code for gender identity disorder in remission.
These codes should be assigned only when the documentation supports the specific diagnosis or history being reported.
ICD-10-CM 2027 Deleted Codes and Their Replacements
One of the most important tasks before October 1 is reviewing deleted or invalidated codes.
A deleted code from FY 2026 should not simply remain on your EHR quick-pick list, coding cheat sheet, encoder, or superbill for FY 2027.
Some important examples include:
| Old Code | FY 2027 Change | New Direction |
| D69.1 | Deleted/restructured | D69.11 / D69.19 |
| I42.0 | Deleted/restructured | I42.00 / I42.01 / I42.09 |
| I42.8 | Deleted/restructured | I42.81 / I42.89 |
| I49.8 | Deleted/restructured | More specific I49.8x options |
| M72.2 | Reorganized | More specific plantar fascial codes |
| S23.420- | Deleted | Review new applicable injury coding |
| Z68.1 | Deleted/restructured | Z68.18 / Z68.19 |
| Z87.890 | Deleted/restructured | More specific Z87.890x history codes |
The complete official Addendum should always be used for the definitive code-by-code list rather than relying on a summary article. CMS has published the FY 2027 Addendum and full code tables for this purpose. (CMS)
S23.420-: Sternoclavicular Sprain Codes Deleted
A particularly useful change for orthopedic and injury coders is the deletion of the S23.420- family.
The affected codes include:
- S23.420
- S23.420A
- S23.420D
- S23.420S
These represented sprain of the sternoclavicular joint/ligament.
Before October 1, 2026, coders should understand the existing code. For FY 2027 encounters, however, the deleted code should no longer be selected.
The ACDIS summary specifically identifies these sternoclavicular sprain codes among the deleted FY 2027 codes. (ACDIS)
Why Are So Many ICD-10-CM Codes Being Changed?
The easiest way to understand the FY 2027 update is:
ICD-10-CM is becoming more specific.
The update frequently asks coders to identify:
- Exact anatomical location
- Right vs. left
- Disease subtype
- Genetic vs. non-genetic condition
- Specific toxic substance
- Pregnancy details
- Encounter type
- Personal history
- Specific metastatic site
For medical coders, this means documentation matters more than ever.
How Medical Coders Should Prepare for ICD-10-CM 2027
You do not need to memorize all 190 new codes.
Instead, use this simple five-step method:
Step 1: Learn the high-volume changes
Start with conditions you code regularly.
For example:
- Cardiology
- Orthopedics
- Emergency medicine
- Oncology
- OB/GYN
- ENT
- Toxicology
Step 2: Identify deleted codes
Search your current coding tools for FY 2027 deleted codes.
Remove or update them from:
- EHR favorites
- Encoder tools
- Cheat sheets
- Charge sheets
- Superbills
- Coding templates
Step 3: Learn the replacement code family
Do not memorize an old code and its replacement separately.
Learn them as a family.
Example:
I42.0 → I42.00 / I42.01 / I42.09
That makes the change easier to remember.
Step 4: Read the Tabular List
Never choose a new code based only on the code title.
Check:
- Includes
- Excludes1
- Excludes2
- Code first
- Use additional code
- Code also
- Notes
- Required 7th character
Step 5: Review the FY 2027 Official Guidelines
The FY 2027 Official ICD-10-CM Guidelines are part of the official release and should be reviewed along with the new code set. (CMS)
ICD-10-CM 2027: Final Takeaway
The FY 2027 ICD-10-CM update brings 190 new codes, 30 deleted codes, and 4 revised code descriptions, effective October 1, 2026. (ACDIS)
The most important lesson is not to try to memorize every change.
Instead:
Find the diagnosis → check the Index → verify the Tabular List → review the guidelines → choose the most specific supported code.
Pay special attention to the new changes involving:
- Secondary malignant neoplasms
- Pelvic diseases
- Odontogenic sinusitis
- Plantar fasciitis
- Cardiomyopathy
- Qualitative platelet disorders
- Postprocedural hypoglycemia
- Pregnancy and vanishing twin syndrome
- Toxic effects
- BMI
- Gender-related history
- Deleted and reorganized code families
The official CMS FY 2027 ICD-10-CM files include the complete Code Tables and Index, Tabular descriptions, Addendum, Conversion Table, POA-exempt codes, and Official Coding Guidelines. (CMS)
For medical coders and CPC students, the best approach is simple: don’t memorize blindly—understand the reason behind the code change.
That makes ICD-10-CM 2027 much easier to learn, remember, and apply correctly.
Official ICD-10-CM 2027 Resources
Always verify the final code selection using the official CMS/CDC FY 2027 files before coding a real claim.
Effective date: October 1, 2026
Code set period: October 1, 2026 – September 30, 2027
Official source: CMS and CDC FY 2027 ICD-10-CM files. (CMS)
