2025 ICD-10-CM Diagnosis Code N40.0

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

Clinical Classification

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Clinical Information

• Prostatism

  lower urinary tract symptom, such as slow urinary stream, associated with prostatic hyperplasia in older men.

• Prostatic Hyperplasia

  increase in constituent cells in the prostate, leading to enlargement of the organ (hypertrophy) and adverse impact on the lower urinary tract function. this can be caused by increased rate of cell proliferation, reduced rate of cell death, or both.

Code Edits

The Medicare Code Editor (MCE) detects errors and inconsistencies in ICD-10-CM diagnosis coding that can affect Medicare claim validity. These Medicare code edits help medical coders and billing professionals determine when a diagnosis code is not appropriate as a principal diagnosis, does not meet coverage criteria. Use this list to verify whether a code is valid for Medicare billing and to avoid claim rejections or denials due to diagnosis coding issues.

MS-DRG Mapping for ICD-10-CM Code N40.0

Diagnosis-Related Groups (DRGs) are used to classify hospital cases for billing and healthcare management. They help standardize how hospitals and other providers are reimbursed for inpatient care. Patients are grouped based on their principal diagnosis into broader categories called Major Diagnostic Categories (MDCs).

Once assigned to a DRG, the hospital receives a set payment for the patient’s care, regardless of the actual services provided. This fixed rate is intended to cover the typical cost of treating patients within that group. The payment amount depends on the DRG's relative weight, which reflects the expected complexity and cost of care based on the severity of the patient’s condition.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V42.0 applicable from 10/01/2024 through 09/30/2025.

Convert N40.0 to ICD-9-CM

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

Patient Education

Enlarged Prostate (BPH)

What is the prostate?

The prostate is a gland in the male reproductive system. It lies just below the bladder. It makes fluid that is part of semen.

What is an enlarged prostate (BPH)?

An enlarged prostate is when your prostate gland becomes larger than normal. It's also called benign prostatic hyperplasia or BPH for short. Benign means not cancer. And hyperplasia means too much cell growth. BPH isn't cancer and it doesn't increase your risk of getting prostate cancer.

Usually, the prostate gland continues to grow during adult life. That's why BPH is the most common prostate condition in people over age 50. As the prostate gets bigger, it may press against the bladder and pinch the urethra. This can slow or block the flow of urine out of your bladder.

Over time, the bladder muscle may become weak from trying to pass urine through a narrow urethra. When this happens, your bladder may not empty completely when you urinate. A narrowed urethra and weak bladder cause many of the urinary problems you may have with BPH.

What causes an enlarged prostate (BPH)?

Researchers aren't sure why the prostate keeps growing. Some researchers think changes in hormones with aging may cause the prostate to get bigger.

Who is more likely to develop BPH?

You're more likely to develop BPH if you:

• Are age 40 or older. The chance of getting BPH increases as you get older.
• Have family members who have had BPH.
• Have certain health conditions such as:
  • Obesity.
  • Heart disease and problems with blood circulation.
  • Type 2 diabetes.
  • Erectile dysfunction.
• Don't get enough physical activity.

What are the symptoms of BPH?

Symptoms of BPH include:

• Having a frequent or urgent need to urinate
• Waking up many times to urinate
• Having problems with urine flow, such as:
  • Trouble starting to urinate
  • A stream that's weak, slow, or stops and starts
  • Dribbling after urination
  • Urinary incontinence
  • Feeling that you can't completely empty your bladder
• Pain after ejaculation or during urination
• Urine with an unusual color or smell

It's important to see your health care provider if you have any of these symptoms because they could be from a more serious health problem.

You should get medical help right away if you:

• Can't urinate at all
• Have fever and chills with urination that's painful, frequent, and urgent
• Have blood in your urine
• Have pain in your lower abdomen (belly) and urinary tract

What other problems can BPH cause?

For most people, BPH doesn't cause other problems. But BPH increases your chance of developing serious conditions, including:

• Acute urinary retention. With this condition, you suddenly can't urinate at all. This a medical emergency. Acute urinary retention is common in older males and the chance of having it increases with age. It may be triggered by:
  • Taking certain over-the-counter cold or allergy medicines
  • Drinking alcohol
  • Cold temperatures
  • Not moving enough over a long period of time
• Urinary tract infections (UTIs)
• Bladder damage and bladder stones
• Kidney damage

How is BPH diagnosed?

To find out if you have BPH, your provider will:

• Ask about your medical history. Be sure to tell your provider about all the medicines you take, because certain medicines can make BPH symptoms worse.
• Ask about your family health history.
• Examine you. The exam may include a digital rectal exam (DRE) of your prostate. In a DRE, your provider inserts a gloved finger into your rectum to check if your prostate is large, tender, or irregular in any other way.
• Order medical tests, if needed, such as:
  • Urine tests.
  • A PSA blood test (prostate-specific antigen test).
  • Urodynamic testing to see how well you can hold and release urine.
  • Cystoscopy to look inside your urethra and bladder.
  • Ultrasound pictures of your prostate and urinary tract.
  • A prostate biopsy to diagnose or rule out prostate cancer.

What are the treatments for BPH?

Not everyone needs treatment for BPH. Treatment options depend on how much your symptoms bother you, your health, age, and the size of your prostate:

• Lifestyle changes may improve mild symptoms. They include:

  • Drinking less before bedtime or going out
  • Avoiding or cutting back on beverages with caffeine and alcohol
  • Bladder training and exercising the muscles that control urine flow
  • Preventing or treating constipation
  
  

• Medicines can help mild to moderate symptoms by:

  • Stopping the prostate from growing
  • Shrinking the prostate
  • Relaxing muscles to improve urine flow
  
  

  Sometimes combining 2 types of medicine helps more than taking just one type of medicine.

• Medical procedures can help improve moderate to severe BPH symptoms when medicines don't help enough. There are several different types of procedures. They all use an instrument inserted into the urethra to either:

  • Widen the urethra
  • Destroy part of the prostate with heat
  
  

• Surgery may be helpful when symptoms are severe, other treatments haven't helped, or you have another problem, such as bladder damage. Different types of surgery are used to:

  • Remove part or all of the prostate
  • Make cuts in the prostate to take pressure off the urethra
  
  

  Most BPH surgery is done with tools inserted into the urethra.

Your provider can explain the possible benefits and side effects of your treatment options so you can decide what's best for you.

Can BPH be prevented?

Researchers haven't found ways to prevent BPH. You can take care of your prostate health by:

• Talking with your provider about your risk for developing an enlarged prostate
• Getting regular checkups
• Paying attention to your symptoms so you can get treatment early if you see signs of BPH

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

[Learn More in MedlinePlus]

Enlarged Prostate (Benign Prostatic Hyperplasia)

Learn about enlarged prostate, also called benign prostatic hyperplasia, including the causes, risk factors, diagnosis, and treatment options.
[Learn More in MedlinePlus]

Code History

• FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
• FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
• FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
• FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.